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Seroma (Fluid Accumulation under the Skin) in Dogs

Occurrence: common
Location of illness: Skin/Fur

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

A seroma is an accumulation of clear, yellowish fluid that forms under a dog’s skin, often after surgery or injury. This fluid accumulation can cause swelling and interfere with the healing process.

The most important facts at a glance

A seroma is an accumulation of tissue fluid under the skin that commonly occurs in dogs after surgery or traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries.. This fluid accumulation occurs when blood vessels and lymphatic vessels are damaged, allowing fluid to accumulate in the surrounding tissue. This can happen especially after major surgeries such as neutering or 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. removals. Inadequate rest after a procedure can also contribute to seroma formation. Symptoms include a non-painful Swelling under the skin that is compressible and mobile. 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. often involves a physical examination and analysis of the fluid by aspiration. Treatment depends on the size and symptoms of the seroma. Smaller seromas often resolve on their own, while larger ones can be treated by aspiration or surgery. 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 if the seroma is detected and treated early. Good postoperativePostoperative refers to the time after a surgical operation. This phase includes recovery and the management of possible complications after the procedure. care and adherence to rest periods are crucial for preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring.. Research focuses on improved surgical techniques and the role of drugs to reduce Inflammatory conditions and promote healing. Genetic factors and 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. are also being investigated to better understand and prevent seroma formation.

Causes

A seroma occurs when tissue fluid that normally circulates in the blood vessels leaks into the space between the skin and the underlying tissue. This fluid can accumulate in response to surgical procedures, traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries., or other tissue damage.

In dogs, a seroma can occur after surgery when blood vessels are injured and fluid leaks into the surrounding tissue. This often occurs with larger surgical procedures where significant tissue movement or manipulation has occurred, such as neutering, 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. removals, or orthopedic surgeries.

Another common reason for seroma formation is traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries. that damages blood vessels and lymphatic vessels, allowing fluid to leak into the surrounding tissue. The severity of the traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries. and the area affected can influence the size and effects of a seroma.

Another factor that can contribute to seroma formation is inadequate rest after surgery. If dogs are too active while their bodies are trying to heal, this can lead to additional irritation and fluid accumulation.

Symptoms

Very common symptoms:

The most noticeable symptom of a seroma in dogs is a soft Swelling under the skin at the site of a recent surgery or injury. This Swelling may feel warm, but is usually not painful.

In some cases, a seroma may cause redness or mild Inflammatory conditions in the area around the Swelling. The dog may also show signs of discomfort if the area is touched or manipulated.

Although a seroma is usually harmless, it can become problematic if it becomes infected. Signs of an 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. may include Fever, Pus formation, or increased Pain. In such cases, immediate veterinary treatment is required.

Diagnosis

To diagnose a seroma, the veterinarian will usually perform a thorough physical examination of the dog and consider the medical 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., especially recent surgeries or injuries.

An important diagnostic step is aspiration, which involves using a needle to take a sample of the accumulated fluid. This sample is then analyzed to determine the type of fluid and rule out an 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..

In some cases, the veterinarian may also use imaging techniques such as 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. to better determine the exact location and size of the seroma. These methods help to rule out other possible causes of the Swelling, such as Abscesses or Tumors.

Therapy

The treatment of a seroma depends on its size and the symptoms associated with it. Smaller seromas that do not cause discomfort are often monitored, as they often resolve on their own.

For larger or painful seromas, aspiration can be performed to remove the fluid and relieve the pressure. This procedure can be repeated several times until the seroma no longer refills.

In cases where the seroma has become infected or does not respond to conservative treatments, surgery may be necessary to drain it and clean the area. Antibiotics may be prescribed to prevent or treat an 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..

In addition to medical treatment, applying warm compresses and restricting the dog’s activity can help promote healing and prevent seroma formation.

Prognosis and follow-up care

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 dogs with seromas is generally good, especially if the seroma is detected early and treated appropriately. Most seromas resolve on their own over time without long-term effects on the dog’s health.

Complications can occur if a seroma becomes infected or is not treated properly. In such cases, more intensive treatment may be needed to control the 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 support the healing process.

Full recovery can vary depending on the size of the seroma and the response to treatment. Dogs that follow the veterinarian’s instructions, especially regarding rest and exercise, have the best chance of a quick and full recovery.

Prevention

Preventing seromas begins with careful postoperativePostoperative refers to the time after a surgical operation. This phase includes recovery and the management of possible complications after the procedure. care. After surgery, it is important to follow the veterinarian’s instructions regarding the dog’s rest and exercise exactly to avoid excessive stressStress refers to the state of an organism reacting to external stimuli or demands. In veterinary medicine, stress can have physical or psychological effects on animals, impacting their health and well-being. on the tissue.

Wearing an appropriate bandage or compression can help reduce the risk of seroma formation by minimizing the space for fluid accumulation. However, the bandage should not be too tight to avoid impairing blood flow.

Regular follow-up examinations with the veterinarian can help detect and treat seromas early before they become major problems. Careful observation of the surgery or injury site for signs of Swelling or fluid accumulation is also important.

Another preventive approach is to minimize the risk of traumaA trauma refers to a physical injury or damage caused by external force. Traumas can range from simple cuts to severe multiple injuries. by keeping the dog in a safe environment and avoiding excessive physical activities that could lead to injuries.

Outlook on current research

Research into the treatment and preventionPrevention includes measures taken to prevent diseases or injuries. In veterinary medicine, this includes vaccinations, parasite control, and health monitoring. of seromas in dogs is a dynamic field that is constantly evolving. A seroma is an accumulation of clear fluid that typically forms under the skin after surgery or injury. Scientists are currently investigating various approaches to minimize the risk of seromas forming, as well as effective methods for treatment should they occur.

A significant area of research focuses on the surgical techniques themselves. By improving surgical methods, researchers hope to prevent the development of seromas from the outset. This includes the development of minimally 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. techniques and the optimization of surgical suturing methods to minimize the space in which fluid could accumulate. The use of special drains, which are placed during and after operations, is also being intensively studied.

Another research approach lies in the role of drugs and supplements that can promote healing and reduce Inflammatory conditions. Here, it is being examined whether certain medications or natural substances can reduce the likelihood of seroma formation. Studies are also investigating the potential effect of anti-inflammatory drugsAnti-inflammatory drugs are medications that reduce inflammation. They can be divided into nonsteroidal anti-inflammatory drugs (NSAIDs) and corticosteroids and are used in dogs and cats to reduce Inflammatory conditions and Pain. to modulate the body’s response to surgical procedures.

In the area of preventive measures, the importance of proper care after the operation is also being investigated. Researchers are analyzing how factors such as the dog’s physical activity, the hygiene of the surgical wound, and general health monitoring can have an impact on healing and seroma formation. Evidence that optimal aftercare could be crucial is gaining importance.

Another exciting branch of research is concerned with the 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. of some dogs for the development of seromas. It is being investigated whether there are genetic markers that indicate an increased susceptibility, which could lead to targeted precautionary measures. In the long term, these findings could help to better assess individual risks and develop prophylactic measures.

In addition, the role of 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. in seroma formation is being investigated. Researchers are trying to understand how 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. responds to surgeries and injuries and how this response may affect seroma formation. These findings could lead to new therapeutic approaches that aim to modulate the excessive 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..

Overall, research into seromas remains an exciting and important field, with many parallel studies aimed at improving the quality of life of dogs after surgical procedures and minimizing complications. The findings from these studies could be of significance not only for dogs, but also for other animals and possibly for human medicine.

Frequently asked questions (FAQs)

What is a seroma in dogs? A seroma is an accumulation of clear, yellowish fluid under the skin that often forms after surgery or injury. It occurs when lymphatic fluid leaks from damaged tissue and collects in a cavity.
How do I recognize a seroma in my dog? A seroma usually appears as a soft, fluid-filled lump under the skin near a surgical site or injury. The site may be slightly swollen, but usually not painful unless an 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. occurs.
Is a seroma dangerous for my dog? A seroma is usually not dangerous and can often resolve on its own. However, it can cause discomfort and, in rare cases, cause an 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. that requires veterinary treatment.
How is a seroma treated in dogs? Treatment for a seroma can vary. Often it is recommended to simply wait and see, as many seromas heal on their own. In some cases, drainageDrainage refers to the removal of fluid from body cavities, Wounds, or inflamed areas, often using a tube or other device. It is used to prevent infection and promote healing. may be necessary. Anti-inflammatory drugsAnti-inflammatory drugs are medications that reduce inflammation. They can be divided into nonsteroidal anti-inflammatory drugs (NSAIDs) and corticosteroids and are used in dogs and cats to reduce Inflammatory conditions and Pain. or antibiotics may also be prescribed if an 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. is present.
How can I prevent a seroma in my dog? To prevent a seroma, it is important to strictly follow the veterinarian’s aftercare instructions after surgery. This includes rest, avoiding excessive activity, and proper care of the surgical site to reduce the risk of complications.
Can seromas occur in all dogs? Yes, seromas can occur in all dogs, regardless of breed or age, especially after surgeries or major injuries. However, certain factors, such as the size of the dog or the extent of the surgery, can influence the risk.
How long does it take for a seroma to heal? The healing time for a seroma can vary. Smaller seromas may heal within a few weeks, while larger or complicated cases may take longer. Veterinary monitoring can help monitor the healing process.
Can a seroma disappear on its own? Yes, many seromas disappear on their own without treatment. The body absorbs the excess fluid over time as the tissue heals. Nevertheless, a veterinarian should be informed to monitor the course and rule out possible complications.
Is it always necessary to treat a seroma? Not always. In smaller, uncomplicated seromas, it is often simply waited and seen. However, treatment may be necessary for large or painful seromas, or if an 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. is suspected.
What should I do if I suspect a seroma in my dog? If you suspect a seroma in your dog, you should consult your veterinarian. He can examine the seroma and, if necessary, suggest appropriate treatment or simply monitor the healing process.