Indoor cats that regularly lie in window sills and patches of sunlight can also be exposed to harmful UV radiation. A sunburn on your cat may appear as red skin or hair loss around the temples, the outer tips of the ears, eyelids, lips, nose, and belly.
The skin is regularly exposed to many tumor-causing factors other than solar radiation in the environment: this includes chemical carcinogens (like asbestos or tobacco smoke) and viruses. Hormonal and genetic factors may also play a role. Other less common causes of skin cancer in cats include serious burns and physical trauma. Some cats are genetically predisposed to be more likely to develop cancers of the skin; hormones, particularly in unaltered cats, can influence this possibility too.
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Basal cell tumors are growths that stem from the base of the top layer of the skin. They can be benign (noncancerous), or malignant (cancerous). A benign growth of these cells is a basal cell tumor, while a malignant growth is called a basal cell carcinoma. Benign tumors can present as firm, solitary, often hairless or ulcerated lumps anywhere on the body and are common in older cats. Domestic Longhair, Himalayan, and Persian are the breeds most at risk.
The malignant form of this cancer often appears as flat, easily spread ulcers on the head, legs, or neck. Unlike benign basal cell tumors, these carcinomas are not usually raised up from the skin. Persians have a particular predilection for this form of basal cell tumor, but it is generally found in older cats.
Mast cell tumors, the second most common skin tumor in cats, occur in two variations: a mast cell type and a histiocytic type. Occurring in most middle to older age cats, they can present anywhere on the body but typically affect the head and neck the most as hairless growths. While they can be malignant, these tumors are usually benign.
Fibrosarcomas are a type of soft tissue sarcoma that grows rapidly and can spread. There are three recognized types of fibrosarcoma in cats: multiple form caused by the feline sarcoma virus; solitary form not caused by feline sarcoma virus; and injection site sarcomas, which develop in the soft tissues where cats are commonly vaccinated. This type of skin tumor varies greatly in appearance, size, and interpretation on physical exam.
We want to call particular attention to squamous cell carcinoma (SCC) because it tends to be malignant and aggressive if it goes undetected. If detected early, however, this type of skin cancer in cats is highly treatable.
Melanoma in cats is thankfully rare. It usually presents as a dark spot on the face, notably the ears, neck, nose, mouth, or eyes; less commonly it can develop on other areas of the body, such as the lower legs, particularly in middle-aged to older cats. Unlike SSC, cat melanoma is not typically associated with sun damage, as melanoma in humans is.
While most bumps and lesions found on cats are benign, you can never be too cautious. Your vet will likely perform a fine needle aspiration or biopsy to confirm if there is cancer and which type. The vet may also order X-rays to determine whether the cancer has spread to other areas of the body. 152ee80cbc
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