What areas are primarily affected by Bowen's disease and squamous cell carcinoma in cats?

Bowen's disease and squamous cell carcinoma in cats primarily affect the ear, nose, and periocular skin due to their vulnerability to ultraviolet (UV) radiation exposure. These areas of the body have less fur coverage and are often exposed to sunlight, making them more susceptible to the harmful effects of UV rays, which can lead to DNA damage and the development of skin lesions or tumors. Cats with lighter pigmentation or those that spend more time outdoors are at a higher risk for developing these conditions.

In particular, squamous cell carcinoma is a common form of skin cancer in cats that arises in these areas. Lesions may start as precancerous changes, such as Bowen's disease, which is characterized by atypical squamous cells, and can progress to invasive carcinoma. Recognizing the risk and early detection in these highly affected areas is crucial for successful intervention and treatment.