Home » Diseases » In dogs » Corneal Dermoid (Displaced Skin and Hair Tissue on the Cornea of the Eye)

Corneal Dermoid (Displaced Skin and Hair Tissue on the Cornea of the Eye) in Dogs

Occurrence: very rare
Location of illness: Head/Neck

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

A corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. is a rare, 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. growth of skin tissue that forms on a dog’s cornea. This tissue often contains hair and can cause significant irritation and visual disturbances.

The most important facts at a glance

A corneal dermoid is a rare eye anomalyAn anomaly is a deviation from what is considered normal or expected. In medicine, it often refers to unusual physical or genetic characteristics that may be present at birth or develop later. in dogs where skin tissue grows on the cornea. The cornea is the clear outer layer of the eye that refracts and protects light. The exact reason for the development of a dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. is unclear, but genetic factors play a role, which is why certain dog breeds such as Golden Retrievers, Bernese Mountain Dogs, and Dachshunds are more often affected. During embryonic development, skin cells can develop in the wrong place, leading to skin and hair on the cornea.

Symptoms include visible islands of hair on the cornea, inflammatory conditions, and increased tear flow. 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. is made by a veterinary eye examination, often with a slit lampA slit lamp is a special microscope used in veterinary ophthalmology to examine the anterior structures of the eye in detail, including the cornea, the iris, and the lens. Examination with a slit lamp can aid in the diagnosis of eye diseases in dogs and cats. or fluorescein stainingFluorescein staining is a diagnostic technique that uses fluorescein, a fluorescent dye, to make tissues, cells, or microbiological samples visible under a microscope, especially in ophthalmology to detect damage to the cornea.. Treatment is usually surgical to remove the abnormal tissue and repair the cornea. After the operation, eye drops and antibiotics are necessary. 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 good if treated early, although slight scars may remain.

Preventive measures are limited, but targeted breeding planning can help in genetically susceptible dogs. Regular eye examinations are important to detect dermoids early. Research focuses on genetic causes, improved diagnostic methods, and alternative treatments such as laser therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. or stem cell regeneration to improve healing and quality of life for affected dogs.

Causes

The cornea is the transparent outer layer of the eye, which plays an essential role in light refraction and protecting the inner structures of the eye. A dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. is a type of choristoma, meaning that normal tissue grows in an atypical location. In the case of a corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body., it is skin tissue that grows on the cornea.

The exact cause of a corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. is not fully understood, but genetic factors are believed to play a role. This means that certain dog breeds are at higher risk of developing this anomalyAn anomaly is a deviation from what is considered normal or expected. In medicine, it often refers to unusual physical or genetic characteristics that may be present at birth or develop later. due to their genetic 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.. Some breeds that are more commonly affected include Golden Retrievers, Bernese Mountain Dogs, and Dachshunds.

During the embryonic development of the dog, faulty cell division or differentiation can occur, leading to skin cells, which are normally found elsewhere in the body, being integrated into the cornea. These cells then continue to grow like normal skin tissue, which explains the presence of hair and sebaceous glands.

Symptoms

Very common symptoms:

A corneal dermoid can lead to a variety of symptoms, mainly related to the physical presence of skin and hair on the cornea. One of the most common symptoms is irritation of the eye, which can lead to increased blinking or closing of the affected eye.

Dogs with a corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. also often show signs of eye discharge, which may be clear or purulentPurulent refers to pus or the production of pus, which may indicate a bacterial infection. Purulent inflammatory conditions are often painful and may have significant swelling and redness., depending on the severity of the irritation or infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease.. The presence of hair on the cornea can also lead to scratches or ulcers, which can lead to pain and further complications.

Another symptom is the impairment of vision, especially if the dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. covers a large area of the cornea. In some cases, the eye may appear cloudy due to constant irritation.

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 a corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. is usually made by a thorough examination of the eye by a veterinarian. During the examination, the eye is examined for irregular growths, hair, or signs of irritation. A dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. can often be recognized with the naked eye, especially if it contains hair.

In some cases, the veterinarian may perform a slit-lamp examination to examine the structure of the cornea more closely. This examination allows the exact size and depth of the dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. to be determined and possible damage to the cornea to be identified.

In addition, fluorescein stainingFluorescein staining is a diagnostic technique that uses fluorescein, a fluorescent dye, to make tissues, cells, or microbiological samples visible under a microscope, especially in ophthalmology to detect damage to the cornea. can be used to visualize any corneal ulcers or injuries. This examination helps to determine the necessity and urgency of surgical intervention.

Therapy

The treatment of a corneal dermoid is usually surgical. The procedure aims to remove the abnormal tissue and restore the cornea as much as possible. This is often done under general anesthesiaGeneral anesthesia is a medical procedure that induces unconsciousness and eliminates pain during surgical procedures. It involves the use of anesthetics to temporarily shut down the body's overall perception. to ensure that the dog remains calm and experiences no pain during the procedure.

During the operation, the dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. is carefully separated from the cornea, taking care not to damage the underlying cornea. In some cases, an additional corneal transplant may be necessary to replace the removed area and strengthen the structure of the cornea.

After the operation, the dog usually receives eye drops and antibiotics to prevent infectionAn infection is the colonization and multiplication of pathogens such as bacteria, viruses, fungi, or parasites in an organism, which often, but not always, leads to a disease. and promote healing. The healing process can take several weeks, and regular follow-up examinations are important to avoid complications.

Prognosis and follow-up care

The prognosis for dogs with a corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. is generally good, especially if the condition is detected and treated early. Surgical removal of the dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. usually leads to a significant improvement in symptoms and vision.

The complete restoration of vision depends on the size and location of the dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body., as well as any damage that occurred before removal. In some cases, slight scarring may remain on the cornea, but this only slightly impairs vision.

Longer-term complications are rare, but regular monitoring by the veterinarian can help to detect and treat potential problems early.

Prevention

Since the exact causes of a corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. are not fully understood, there are limited preventive measures. In dogs that are genetically predisposed, careful breeding planning can help to minimize the risk.

Regular eye examinations can help detect a dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. early, before it leads to serious complications. Early 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. and treatment can significantly reduce the risk of long-term damage.

For dog owners, it is important to watch for signs of eye irritation or visual disturbances and to see a veterinarian immediately if a problem is suspected. Early intervention is key to avoiding serious complications.

Outlook on current research

Research into corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. disease in dogs is an ongoing development process. Scientists are striving to better understand the genetic components of this disease, as there is evidence that certain breeds are more commonly affected. It is believed that genetic mutations may play a role in the development of dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. formations on the cornea. Therefore, some studies focus on identifying potential genetic markers that could indicate a 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 this disease.

A significant focus of current research is on improving diagnostic methods. Traditionally, corneal dermoid is diagnosed by clinical examination, but scientists are working to develop advanced imaging techniques that allow for a more accurate assessment of the extent and depth of the dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body.. These technologies could improve the planning of surgical procedures and increase the success rate.

The treatment of corneal dermoids often involves surgical procedures to remove the affected tissues. However, researchers are also investigating alternative treatment options, such as the use of laser therapies. Early studies suggest that laser treatments may be a less invasiveInvasive describes medical procedures or pathogens that enter the body or penetrate tissue. In medicine, invasive procedures can range from minimally invasive techniques to open surgery. option that leads to faster recovery while reducing the risk of complications.

Another promising research approach relates to the regeneration of corneal tissue. Scientists are exploring the possibility of using stem cells to promote the healing and regeneration of damaged corneal tissue. This innovative therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. could be a groundbreaking alternative to traditional surgical removal of dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. tissue in the future.

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. for dogs with corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. varies, depending on the severity of the disease and the treatment method used. Research aims to improve the quality of life of affected dogs and minimize the risk of recurrence of the disease. By combining genetic research, advanced diagnostic procedures, and new treatment methods, scientists hope to develop more comprehensive and effective treatment options.

Frequently asked questions (FAQs)

What is a corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body.? A corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. is a rare malformation in which skin and hair develop on a dog’s cornea. This anomalyAn anomaly is a deviation from what is considered normal or expected. In medicine, it often refers to unusual physical or genetic characteristics that may be present at birth or develop later. can impair vision and lead to eye irritation.
Which dogs are most commonly affected? Certain dog breeds 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. for corneal dermoids. These include dachshunds, Bernese Mountain Dogs, and Dalmatians, among others. This suggests a genetic component to the disease.
How is a corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. diagnosed? 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. is usually made by a comprehensive eye examination by a veterinarian. Visual inspection is often sufficient, but imaging procedures can be used for more accurate assessment in complex cases.
What symptoms can occur in a dog with corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body.? Symptoms can include watery eyes, frequent blinking, and visible skin and hair structures on the cornea. In severe cases, vision may be impaired.
How is a corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. treated? The most common treatment method is surgical removal of the dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body.. The procedure is usually performed under general anesthesiaGeneral anesthesia is a medical procedure that induces unconsciousness and eliminates pain during surgical procedures. It involves the use of anesthetics to temporarily shut down the body's overall perception. and aims to completely remove the affected tissues.
Are there risks with surgical treatment? As with any surgical procedure, there are risks. These include infections, bleeding, and, in rare cases, complications that can lead to a deterioration of vision. Nevertheless, surgery is often successful and improves the quality of life of the affected animal.
Can a corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. recur? Recurrence is rare but possible, especially if not all of the affected tissue is removed. Regular check-ups with the veterinarian after the operation are important to detect possible relapses early.
How can I help my dog after the operation? After the operation, the veterinarian will give instructions for postoperativePostoperative refers to the time after a surgical operation. This phase includes recovery and the management of possible complications after the procedure. care, which usually includes administering medication, wearing a protective collar, and avoiding activities that could strain the eye.
Are alternative treatment methods available? In addition to surgery, alternative methods such as laser therapyTherapy refers to the treatment of diseases or disorders with the aim of alleviating symptoms, promoting healing, or improving quality of life. Therapies can be medicinal, surgical, or through other medical interventions. are being explored. These may be available as gentler treatment options in the future, but are still in the research stage.
How can I minimize the risk of a corneal dermoidA dermoid is a type of benign tumor made up of mature skin tissue and may contain hair, sebaceous glands, and sometimes teeth or other tissues. The dermoid is already present at birth and can occur in various parts of the body. in my dog? Since it is a genetic disease, preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. is difficult. When choosing a dog, it is advisable to inquire about the genetic historyThe medical history is the systematic collection of a patient's medical history through questioning. It includes information about previous illnesses, treatments, allergies, and lifestyle habits. of the parents and to carry out regular veterinary examinations to detect health problems early.