If You Find a Lump on Your Cat’s Skin — Causes and Drainage Treatment for Skin Abscesses

Skin & CoatDiseasesMeongsiljang Veterinary Advisory Board

Feline skin abscesses are bacterial infections in which pus accumulates under the skin, typically following a fight or injury. Early detection and prompt veterinary treatment are key to recovery.

What Are Feline Skin Abscesses?

A cat with a skin abscess sitting on the examination table at the veterinary clinic.

Feline skin abscesses are localized bacterial infections in which pus (purulent material) accumulates within a pocket-like space in the skin tissue. Because cats have flexible skin, abscesses are the most common form of deep pyoderma. They typically develop when bacteria penetrate deep into the skin through puncture wounds such as bites or scratches sustained during fights with other cats. What’s crucial to remember is that in the early stages, only a small puncture mark may be visible, often hidden by fur, and the abscess usually swells up two to three days after the bite, leading to delayed discovery. If you notice any swollen or painful areas, seek veterinary care promptly.

Main Causes of Feline Skin Abscesses

The most common cause of skin abscesses in cats is fighting with other cats. A cat’s mouth harbors various oral flora, including Staphylococcus species and diverse anaerobic bacteria. When a bite wound occurs, these bacteria can penetrate deep into the skin layers. Because cat teeth are thin and sharp, even wounds that appear as small punctures often cause damage to the subcutaneous tissues, and two parallel puncture marks are highly indicative of a bite. Furthermore, cellulitis (inflammation of the soft tissues) typically develops before the abscess swells, so the absence of palpable pus does not rule out infection. Abscesses can also result from puncture wounds caused by sharp objects, foreign bodies, or the worsening of pre-existing folliculitis.

Key Symptoms Checklist

Swelling: When a specific area swells and fills with pus, it becomes taut yet feels fluctuant when pressed.

Redness and warmth: The skin over the abscess may appear red or feel warmer than the surrounding area.

Pain response: Abscesses are painful, so your pet may flinch or cry out when the area is touched.

Matted fur and scabs: Fur around the wound may become matted, and scabs may form.

Discharge and odor: If the abscess ruptures, thick, foul-smelling pus will drain out.

Loss of appetite and lethargy: If the infection spreads systemically, your pet may become lethargic and eat poorly.

Close-up photo of a skin abscess swelling on a cat's neck

Signs That Require Immediate Veterinary Attention

If your pet exhibits any of the following symptoms, take them to an emergency veterinary clinic immediately: 1) The abscess has ruptured, emitting a strong foul odor with continuous discharge of thick pus; 2) High fever or severe shivering; 3) Reluctance to move, persistent whining, or lethargy; 4) An abscess located on the face around the eyes, nose, or mouth. Prompt action is crucial, as leaving it untreated can allow bacteria to spread throughout the body, potentially leading to sepsis.

Diagnostic Methods

The veterinarian first assesses the abscess’s location, size, and depth through visual inspection and palpation. Next, a fine-needle aspiration (FNA) is performed to collect a small sample of pus, which helps confirm bacterial infection and allows for culture and sensitivity testing to guide antibiotic selection. If the abscess is deep or extensive, ultrasound or X-ray imaging may be used to evaluate the extent of tissue damage. Blood tests may also be conducted to assess the pet’s overall systemic health.

Treatment Methods — A Step-by-Step Guide

Step 1: Incision and Drainage: Under anesthesia, the abscess is surgically opened to drain the pus and reduce the bacterial load. This is the most critical step in treatment. However, if the area is merely swollen and inflamed without yet forming pus, incision may not be necessary.

Step 2: Irrigation and Disinfection: The interior of the abscess is thoroughly flushed with sterile saline to wash away bacteria and facilitate better penetration of antibiotics.

Step 3: Drainage Management: A drainage tube may be temporarily inserted to ensure continuous outflow of pus.

Step 4: Antibiotic Administration: Whenever possible, antibiotics are selected based on culture and sensitivity test results. Depending on the severity of the infection, they are typically prescribed for a few days to one or two weeks.

If pain is severe, anti-inflammatory and analgesic treatments are administered concurrently.

A veterinarian treating a cat's skin abscess wound.

Home Care Tips

Antibiotics must be administered exactly as prescribed by your veterinarian for the full duration of treatment. Stopping the medication early, even if your pet seems to be improving, can lead to antibiotic-resistant bacteria. To prevent your cat from licking the wound, please keep an Elizabethan collar (cone) on at all times. If a drain has been placed, gently clean the area daily according to your veterinarian’s instructions. Contact the clinic immediately if you notice renewed swelling or if your pet develops a fever.

A cat recovering at home while wearing an Elizabethan collar

Preventing Recurrence and Breed-Specific Considerations

Most feline skin abscesses stem from bite and scratch wounds incurred during fights, so reducing fighting is key to preventing recurrence. Keeping your cat strictly indoors minimizes contact with other cats and fights, significantly lowering the risk of abscesses. Unneutered males are more prone to territorial disputes, so neutering can help reduce aggression. Additionally, regularly check your cat’s body for bite marks or swelling, and if you notice any wounds, seek veterinary care early before they develop into abscesses.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can a cat’s skin abscess heal on its own?

Occasionally, a small abscess may rupture on its own and appear to heal. However, if bacteria remain inside, the infection can recur or spread to deeper tissues. It's safest to have a veterinarian treat it.

Is it okay to squeeze out the pus at home?

No, that’s not safe. Squeezing it without sterile conditions can spread bacteria to surrounding tissues and increase the risk of sepsis. It must be treated at a veterinary clinic with anesthesia, incision, and thorough cleaning.

Can antibiotics alone be enough to treat the condition?

If the abscess is still in its early stages, it may improve with antibiotics alone. However, if pus has already accumulated, antibiotics alone will have limited effectiveness without incision and drainage. A veterinary diagnosis should always come first.

How long does it take for the surgical wound to heal?

Recovery time varies depending on the size of the abscess and the severity of the infection, but most pets show visible improvement within one to two weeks. It is essential to complete the full course of antibiotics as directed by your veterinarian.

If one cat in a multi-cat household develops an abscess, are the other cats at risk?

The abscess itself isn’t directly contagious. However, since fights can cause injuries to other cats as well, it’s a good idea to carefully check all your cats for any signs of harm.

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References

[1] Harvey RG, Mckeever PJ and Nuttall TJ (Eds.), BSAVA Manual of Canine and Feline Dermatology, 4th Ed., British Small Animal Veterinary Association, 2019

[2] Gross TL, Ihrke PJ, Walder EJ and Affolter VK, Skin Diseases of the Dog and Cat: Clinical and Histopathological Diagnosis, 2nd Ed., Blackwell, 2005

[3] Norsworthy GD et al., The Feline Patient, 4th Ed., Wiley-Blackwell, 2011