Home » Diseases » In dogs » Mucocutaneous Plasmacytoma (Skin Cancer)

Mucocutaneous Plasmacytoma (Skin Cancer) in Dogs

Occurrence: very rare
Location of illness: Skin/Fur

Author: Dr. med. vet. Gisa Löwe | Last modified: 06.11.2025

Mucocutaneous plasmacytoma is a form of skin cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas. in dogs that originates from plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells, a type of white blood cell, and typically affects the skin and mucous membranes.

The most important facts at a glance

Mucocutaneous plasmacytomas in dogs are caused by an uncontrolled proliferation of plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells that originate from B lymphocytesLymphocytes are a group of white blood cells crucial for the body's adaptive immune response. There are different types, including B cells, T cells, and natural killer cells, each with specific functions in the immune system. and produce antibodies. These tumors often appear as raised cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. nodules on the skin and mucous membranes. The exact causes are unclear, but genetic factors, environmental factors, and possibly immunologic dysregulation may play a role. Certain dog breeds and older dogs are more commonly affected. Symptoms include skin changes, nodule formation, and itching. DiagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. requires a histopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. examination after a biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions.. Additional tests such as blood tests and imaging help determine the extent of the disease. Treatment depends on the size and location of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. and usually involves surgical removal. Radiation or chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. may be necessary if the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. cannot be completely removed. The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. is generally good, as most tumors are benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors.. Early detection and treatment are crucial. Preventive measures include regular veterinary examinations, a healthy diet, and protectionProtection refers to safeguarding against diseases or harm. In veterinary medicine, this can include protecting animals through vaccinations, the use of parasite control products, or providing a safe environment. from excessive sun exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats.. Research focuses on genetic markers, improved diagnostic methods, and new treatment approaches such as immunotherapies. Long-term studies aim to improve the quality of life of affected dogs.

Causes

PlasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells are specialized white blood cells that play an important role in the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. by producing antibodies. These cells develop from B lymphocytesLymphocytes are a group of white blood cells crucial for the body's adaptive immune response. There are different types, including B cells, T cells, and natural killer cells, each with specific functions in the immune system., which play a crucial role in the immune responseAn immune response is the immune system's reaction to foreign substances (antigens), such as microorganisms or proteins. It involves a series of processes aimed at recognizing, fighting, and eliminating these antigens. against infections. In the development of mucocutaneous plasmacytoma, there is an uncontrolled proliferation of these plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells.

These tumors often appear as raised, well-circumscribed cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. nodules on the skin or mucous membranes. The exact cause of plasmacytoma development is not fully understood, but genetic factors, environmental factors, and possibly immunologic dysregulation are believed to play a role.

Some breeds appear to have a higher predispositionA predisposition is an innate inclination or susceptibility of an organism to certain diseases or conditions. In dogs and cats, there may be a genetic predisposition to certain conditions such as hip dysplasia or certain heart diseases. to developing mucocutaneous plasmacytomas, suggesting a genetic component. Middle-aged to older dogs are more commonly affected, suggesting that age-related changes in the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. may also play a role.

Symptoms

Very common symptoms:

Common symptoms:

Crusting on the Skin

The symptoms of mucocutaneous plasmacytoma can vary depending on the location and size of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions.. Typically, these tumors appear as small, raised, reddish or purple cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. nodules on the skin or mucous membrane. They are usually well-defined and can vary in size and number.

Common sites where these tumors occur are the lips, gums, ears, and limbs. In some cases, they can also occur on other parts of the body. Most of these tumors are not painful, but they can cause discomfort if irritated or infected.

Occasionally, these tumors may ulcerate or bleed, especially if they are located in areas that are frequently exposed to rubbing or traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries.. In rare cases, systemic symptoms such as lethargy or weight loss may occur, especially if the tumor has reached a significant size or if it causes secondary complications.

Diagnosis

The diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. of mucocutaneous plasmacytoma usually begins with a thorough physical examination by a veterinarian. Suspicion of plasmacytoma may be raised based on the characteristic appearance of the skin lesions.

However, a histopathologicalHistopathological refers to the microscopic examination of tissue samples for the diagnosis of diseases. This technique is used to identify the specific characteristics of diseases at the cellular level in dogs and cats. examination is required to confirm the diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients.. This involves taking a biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions. of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions., which is then examined under a microscope by a pathologist. On histological examination, a plasmacytoma typically shows an accumulation of abnormal plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells.

In addition to the biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions., the veterinarian may also perform blood tests, X-rays, or ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. examinations to assess the extent of the disease and the presence of metastasisA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body.. These additional tests are particularly important to rule out other possible causes of the symptoms and to develop a comprehensive treatment plan.

Therapy

The treatment of mucocutaneous plasmacytomas depends on several factors, including the size and location of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions., the dog’s age and general health, and the presence of metastasisA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body.. In many cases, the primaryPrimary refers to the first or original cause of a disease or condition, as opposed to secondary causes or symptoms that develop from it. treatment is surgical removal of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions..

Surgical procedures are generally successful, especially if the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. is detected early and completely removed. Additional treatment may be necessary in cases of incomplete removal or tumors in complicated locations.

Radiation therapyRadiation therapy is the use of radiation, most often to treat cancer. It can be used to kill cancer cells or slow their growth without significantly damaging surrounding healthy tissue. may be considered if the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. cannot be completely removed or if there is evidence of remaining cancerous cells. In some cases, chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. may also be used, especially if the tumor is aggressive or shows signs of metastasizingA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body..

In addition to direct treatment of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions., supportiveSupportive refers to supportive treatments that aim to alleviate symptoms and improve quality of life without directly treating the underlying cause of the disease. measures may be necessary to improve the dog’s quality of life. This may include pain management, nutritional support, and treatment of secondary infections.

Prognosis and follow-up care

The prognosis for dogs with mucocutaneous plasmacytoma is generally good, especially if the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. is detected and treated early. Most of these tumors are benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. and do not tend to metastasize, which significantly improves the chances of a cure.

With complete removal of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions., the likelihood of recurrence is low. However, in cases where the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. cannot be completely removed or is more aggressive in nature, the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. may vary. Careful monitoring and regular follow-up examinations are important to detect recurrence or the appearance of new tumors early.

The long-term prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. also depends on other factors, such as the dog’s general health and the presence of other diseases. Close collaboration with the veterinarian is crucial to ensure the best possible treatment and care.

Prevention

Since the exact causes of mucocutaneous plasmacytomas are not fully understood, there are no specific measures to prevent these tumors. However, there are some general recommendations that can help reduce the risk of skin cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas. in dogs.

Regular examinations by a veterinarian are important to detect and treat skin changes early. Watch for unusual cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. nodules or changes in your dog’s skin and seek veterinary advice promptly if you have any concerns.

A healthy diet and a strong immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. can also help reduce the overall risk of cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas.. Make sure your dog receives a balanced diet and is regularly vaccinated and dewormed to maintain its health.

ProtectionProtection refers to safeguarding against diseases or harm. In veterinary medicine, this can include protecting animals through vaccinations, the use of parasite control products, or providing a safe environment. from excessive sun exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. can also help reduce the risk of skin cancer. Avoid exposing your dog to direct sunlight during the hottest hours of the day, and use sunscreen specifically designed for pets where appropriate.

Outlook on current research

Research on mucocutaneous plasmacytomas in dogs has made progress in recent years, particularly in the field of molecular biology and genetic analysis. Scientists are focusing on identifying genetic markers that may be associated with the development of these tumors. By understanding the genetic basis, targeted therapies could be developed in the future that target the specific genetic mutations.

Another research focus is on improving diagnostic methods. Currently, research is being conducted on imaging techniques that could allow earlier and more accurate detection of plasmacytomas. Methods such as high-resolution ultrasoundUltrasound refers to sound waves that are above the hearing threshold of the human ear. In medicine, ultrasound is used for diagnostic imaging procedures to visualize internal organs, tissues, and blood flow. technology and magnetic resonance imaging (MRI)Magnetic resonance imaging is an imaging technique that uses strong magnetic fields and radio waves to create detailed images of the inside of the body. It is used in veterinary medicine to diagnose diseases of the brain, spine, and other organs. could play an important role in diagnosisA diagnosis is the identification of a disease or condition by its symptoms and/or results from diagnostic tests. It is the first step in the management and treatment of patients. in the future by providing detailed images of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. structure.

In terms of treatment, new chemotherapeutic agents and immunotherapies are being developed. Immunotherapy, which stimulates the dog’s immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body. to fight the cancerCancer refers to the uncontrolled proliferation of cells that can lead to tumors or spread throughout the body. Various types of cancer occur in dogs and cats, ranging from skin cancer to lymphomas. cells themselves, has shown promising results in preclinical studies. Researchers are also investigating the effectiveness of combination therapies, in which chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. is combined with other forms of treatment to increase effectiveness.

Long-term studies on the quality of life and survival rate of dogs with mucocutaneous plasmacytoma are also ongoing. These studies are designed to help better understand how different treatment approaches affect the quality of life of affected animals and how prognoses can be improved. A particular focus is on minimizing side effects and improving quality of life during and after treatment.

Finally, there are also research projects that focus on the preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of mucocutaneous plasmacytomas. This includes investigating environmental factors that could increase the risk of developing these tumors, as well as exploring potential preventive measures that could prevent the occurrence of plasmacytomas.

Frequently asked questions (FAQs)

What is mucocutaneous plasmacytoma in dogs? A mucocutaneous plasmacytoma is a type of skin tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. that consists of plasmaPlasma is the liquid part of blood in which blood cells are suspended. It contains water, salts, proteins, and other substances and serves as a transport medium for nutrients, hormones, and waste products. cells. These tumors often occur on mucous membranes or the skin and are usually benignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors., but can sometimes become malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats..
How do I know if my dog has mucocutaneous plasmacytoma? Typical signs of mucocutaneous plasmacytoma are cutaneousCutaneous refers to the skin. Cutaneous can be used to describe conditions, treatments, or reactions related to the skin of dogs and cats, such as skin diseases or topical medication application. nodules or bumps on the skin or mucous membrane. These lesions may bleed or become inflamed. An accurate diagnosis requires examination by a veterinarian, often with the help of a biopsyA biopsy is a medical procedure in which a small amount of tissue is removed from the body to be examined under a microscope for signs of disease. Biopsies can help diagnose cancer and other conditions..
Which dog breeds are most commonly affected? Mucocutaneous plasmacytomas can occur in all dog breeds, but are more commonly seen in medium to large breeds such as Boxers, Labrador Retrievers, and German Shepherds.
How is mucocutaneous plasmacytoma treated? Treatment depends on the size, location, and nature of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions.. Surgical procedures are often performed to remove the tumor. In some cases, radiation or chemotherapyChemotherapy refers to the treatment of diseases, especially cancer, with chemical substances or drugs. It aims to kill cancer cells or prevent their growth, but can also affect healthy cells. may be necessary, especially if the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. is malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. or metastasisA metastasis is a secondary tumor that originates from a primary, malignant tumor in another part of the body. Metastases indicate that cancer has spread in the body. has occurred.
What is the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. for a dog with mucocutaneous plasmacytoma? The prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. varies depending on the type and progressionProgression refers to the advancement or worsening of a disease over time. It describes an increase in the severity or extent of the disease symptoms. of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions.. BenignBenign refers to a non-invasive, non-serious condition that is not life-threatening. In medicine, the term is often used to describe benign tumors that do not metastasize, meaning they do not form secondary tumors. tumors often have a good prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. after removal. For malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. tumors, the prognosisThe prognosis is the prediction of the likely course and outcome of a disease based on the general state of health, the nature of the disease, and the response to treatment. It can provide information on how a disease is expected to develop. depends on the aggressiveness of the tumorA tumor is an abnormal growth of tissue that can be benign or malignant. Tumors can develop in any part of the body and affect various functions. and the success of the treatment.
Can a mucocutaneous plasmacytoma recur? Yes, there is a possibility that a mucocutaneous plasmacytoma may recur after treatment, especially if it was not completely removed or if malignantMalignant means "cancerous" and is used to describe tumors or neoplasms that grow invasively and have the ability to metastasize. Malignant tumors can cause serious health problems in dogs and cats. cells remain. Regular follow-up examinations are important to detect recurrence early.
What role does nutrition play in the preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of mucocutaneous plasmacytomas? There are no specific nutritional guidelines for the preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of mucocutaneous plasmacytomas. However, a balanced diet rich in antioxidants can contribute to the dog’s overall health and strengthen the immune systemThe immune system is the body's defense system against infectious agents such as bacteria, viruses, fungi, and parasites. It comprises a complex network of organs, cells, and molecules that work together to protect the body..
Are there risk factors that promote the development of mucocutaneous plasmacytoma? While the exact causes are not fully understood, genetic factors and possibly environmental factors may play a role. An increased risk may exist in dogs exposed to high UV radiation or certain chemicals.
Can a mucocutaneous plasmacytoma be transmitted to humans? No, mucocutaneous plasmacytomas are not zoonotic diseases and cannot be transmitted from dogs to humans.
What precautions can I take to reduce the risk of mucocutaneous plasmacytomas? Regular veterinary check-ups and observing skin changes in your dog are important precautions. Keep your dog away from harmful chemicals and avoid excessive sun exposureExposure refers to the Contact with or subjection to certain substances, environmental factors, or pathogens. In veterinary medicine, this can include Contact with toxins, allergens, or infectious agents that can cause health problems in dogs and cats. to minimize the risk.