Since there are many types of skin conditions that may cause lesions or discolored patches, identifying a lesion as cancer can only be done by a veterinarian. However, if you notice any of the following symptoms, contact your vet immediately:
- Signs of pain when walking
- Lameness
- Lethargy or weakness
- Masses located on the toes or footpads
- Swollen or inflamed paws
- Blisters
- Draining or bleeding sores
- Excessive grooming of the paws
- Tumors located on other parts of the body
- Discharge from the nail bed
- Coughing up blood
- Loss of appetite
- Weight loss
- Rapid or labored breathing
Types
Malignant cancer, no matter where it originates, has the potential to spread to any part of the body, including the toes. There are several different types of skin cancer, and these can also affect any part of the body. The types discussed here primarily affect a cat’s digits (toes).
Soft Tissue Sarcoma
This type of skin cancer, most commonly found in other areas of a cat’s body, develops in the stem cells. Older cats have a predisposition for developing digital soft tissue sarcoma. This condition, when found in the toes, will usually only affect one digit, and has a high rate of recurrence. At present, metastasis has not been observed, unless the sarcoma is located within the deep tissue. Malignancy seems to correspond with tumor size.
Digital Fibrosarcoma
Similar to soft tissue sarcoma, fibrosarcoma affects the soft tissue of a cat, and may develop anywhere on the body. Fibrosarcoma originates in fibroblasts, which are cells located within the connective tissue that produce collagen. There are three main types of fibrosarcoma, and each has different causes. One type of fibrosarcoma may originate in younger cats from the feline sarcoma virus. Fibrosarcomas may also develop in vaccination sites. And finally, the more common type of fibrosarcoma affects older cats and has no identifiable underlying cause.
Squamous Cell Carcinoma
SCC, while relatively common in cats, only rarely affects the cat’s digits. This is because this kind of tumor generally forms in areas that have less pigmentation, such as the ears, nose, and head. Before a tumor forms, cats will show signs of solar keratosis, in which the skin becomes discolored or thick. Preventative measures for SCC primarily involve limiting the cat’s exposure to ultraviolet light.
Feline Lung-Digit Syndrome
Feline Lung-Digit Syndrome is a type of rare pulmonary cancer that has a strange metastatic pattern. Though the cancer originates in the lungs, tumors will form on the toes and limbs. These tumors can affect multiple toes and limbs. By the time tumors appear on the skin, the lung cancer has usually progressed, and the prognosis is poor.