Final answer:
A rough, crusty skin lesion with a central ulcer on a sun-exposed area is suspicious for Basal cell carcinoma (C), a type of skin cancer that occurs in the basal cells of the epidermis. Basal cell carcinoma is the most common type of skin cancer and is often found on sun-exposed areas like the head, neck, arms, and back.
Step-by-step explanation:
If a skin lesion is rough, crusty, with a central ulcer on a sun-exposed area, it is suspicious for Basal cell carcinoma (C). Basal cell carcinoma is a type of skin cancer that occurs in the basal cells of the epidermis. It is the most common type of skin cancer and is often found on the head, neck, arms, and back, areas that are frequently exposed to the sun. Basal cell carcinomas typically start in the stratum basale and may appear as uneven patches, bumps, growths, or scars on the skin surface.