What Could Cause a Lump on a Cat’s Tail?


Any morbid growths, neoplasms or lumps in cats need close attention. The lump on a tail of a cat can be either a harmless fatty tumor or a malignant neoplasm. It is impossible to identify the cause of the tumor without specific tests, so a loving guardian should not hesitate to visit a specialist as soon as may be.

Tail Injury

Young non-neutered cats often show aggression towards their own kind, therefore, if a pet walks freely outside, there will be injuries. One of the most vulnerable body parts suffering in fights is the tail. After the injury, a solid bump on the tail of a cat may appear. In most cases, it is a purulent follicle or an abscess. These pathologies are dangerous, because if the pus cones are damaged, it can enter the general bloodstream, which leads to infection of the whole organism. It is easy to distinguish an abscess from other pathologies, if you know specific symptoms of purulent inflammation:

  • an increase in skin temperature at the site of an abscess;
  • pain at palpation;
  • restlessness in a pet.

If when the guardian tries to inspect the tail, the animal is restless, hisses and tries to hide the sore area, it is a clear sign of inflammation and pain. You may also notice that the skin around the tumor gets red and hot. An animal with an abscess behaves oddly. The cat pays uncharacteristically much attention to its tail, often nibbles or licks it, thus trying to get rid of the abscess and the pain. It is absolutely imperative to prevent the animal from scratching the abscess, as this may lead to its opening. Trying to get rid of the problem on your own is not recommended, you need to show the animal to a specialist. An abscess or purulent follicle is to be treated surgically. The doctor performs the incision and drainage of an abscess, removing the purulent mass. After removing the pus and cleaning the wound, the cavity is treated with antibacterial solutions. If the wound is large, the doctor will apply sutures.


A hard lump or a tumor on the tail may be due to accumulation of subcutaneous parasites. This often occurs in outdoor cats. Tick ​​infestation is observed in weakened kittens born on the street. Treatment includes anti-parasitic treatment, administration of antiseptics and special ointments. Vitamins are prescribed to support immunity system. The animal must be transferred to a special diet.

Photo of Cats with Lumps on Tail

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Fatty Tumor or Lipoma

A soft bump on the tail of a cat that does not cause discomfort to the animal is most likely a lipoma or a fatty tumor. The growth develops due to the proliferation of the fatty tissue. As a result a small lump of regular shape with a soft structure is formed. A characteristic feature of a fatty tumor is that they can roll under the skin. You can verify this by slightly pulling the area around the lipoma and rolling the tumor with your fingertip. In such a manipulation the cat does not show any signs of discomfort behaves calmly and does not try to escape. Possible causes:

  • Metabolic disorders
  • Endocrine disorders
  • Nutritional Disturbance
  • Hypodynamia.
  • Senior Cats (7 years and older).

Lipomas are a result of the natural process of aging in the animal. In most cases, they are not dangerous, but should better be removed anyway, especially in older animals, as under the influence of various pathogenic factors a benign lipoma can degenerate into a malignant neoplasm.

Surgery is quick and painless. The veterinarian performs local anesthesia and cuts out the tumor. If there is a large wound, left stitches are applied. The tissues after removal are sent for histological analysis to determine the type of cells and exclude the possibility of oncology.

A Cancerous Growth on the Tail

A lump at the base of the tail in a cat may prove to be a malignant growth. It is difficult to tell oncology from benign growths on the tail without proper consultation and a series of tests. At the initial stage, the cancer has no visible manifestations. The lump develops slowly. When it becomes noticeable to the naked eye, other symptoms appear, for example, hair loss in patches or a general deterioration of a pet’s well-being. Cancer usually occurs in senior cats. Treatment includes carcinectomy and chemotherapy. Supportive care, a special diet and vitamin supplements are administered afterwards. In most cases, even timely cured oncology shortens the life of a pet. Lack of treatment can be fatal.

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