Squamous cell cancer usually occurs on the face, ears, neck, hands, or arms. It may occur on other areas.
The main symptom is a growing bump that may have a rough, scaly surface and flat reddish patches.
The earliest form (squamous cell carcinoma in situ) can appear as a scaly, crusted, and large reddish patch that can be larger than 1 inch.
A sore that does not heal can be a sign of squamous cell cancer. Any change in an existing wart, mole, or other skin lesion could be a sign of skin cancer.