Which type of skin cancer is typically associated with sun exposure and can appear as a flat, scaly lesion?

The type of skin cancer that is typically associated with sun exposure and can appear as a flat, scaly lesion is squamous cell carcinoma (SCC). This type of cancer arises from the squamous cells, which are the flat cells located in the outer layer of the skin. Overexposure to ultraviolet (UV) radiation from the sun is a significant risk factor for developing SCC, especially in areas of the skin that are frequently exposed to sunlight, such as the face, ears, neck, and backs of the hands.

SCC can manifest as flat, scaly patches or sores that may bleed or crust over. The characteristics of these lesions make them distinct, as they often have an elevated border and a central area that may appear scaly or rough. Early detection of SCC is crucial since it has the potential to metastasize if left untreated, making prompt medical evaluation important for any suspicious skin changes.

In contrast, melanoma, while also linked to sun exposure, does not typically present as flat and scaly; it often appears as an unusual mole or skin growth. Basal cell carcinoma, another common skin cancer associated with sun exposure, usually presents as pearly, raised lesions rather than flat patches. Keloids, on the other hand