Squamous Cell Carcinoma of the Pinna in Cats

Squamous cell carcinoma of the pinna is a form of skin cancer that arises in the thin, flat cells lining the surface of the ear flap. In cats, this tends to occur in areas where sun exposure has damaged the skin over time, particularly in animals with white or pale ears. The condition develops slowly, often beginning as persistent roughness, redness, or small crusted areas that may come and go before progressing to open sores or thickened patches that do not heal. Owners often notice changes that initially resemble minor injuries or irritation—small scabs, recurring scratches, or areas that bleed easily when touched. These signs may be present for weeks or months before the pattern becomes clear. Because the changes can be subtle at first, and because ear tips are naturally exposed and occasionally injured, it is not always obvious when something more persistent is unfolding. This page explores what squamous cell carcinoma of the pinna can look like in its early and later stages, what is happening in the skin as the condition develops, how veterinary surgeons investigate and confirm the diagnosis, and what approaches exist for managing it. The aim is to help orient you to the condition and the questions that may arise as you and your veterinary team work through what is happening.