What distinguishes squamous cell carcinoma?

Squamous cell carcinoma (SCC) is characterized by certain distinctive features, one of which is the presence of areas of crusted skin, which can often appear near patches of freckles or other forms of pigmentation. This crusting is due to the rapid turnover and abnormal proliferation of squamous cells, which can lead to the formation of lesions that may appear scaly or crusty.

The context of crusted skin is significant because SCC can sometimes begin as a precancerous lesion, often arising in areas that have been subjected to prolonged sun exposure or have been damaged by ultraviolet (UV) radiation. Such lesions may exhibit not only crusting but can also break open and bleed, making them different from other types of skin lesions.

The other characteristics described, such as raised shiny lesions, asymmetrical appearances, and high ridges with depressions in the center, are more typical of other skin cancers or benign skin conditions. For example, raised shiny lesions may be more indicative of basal cell carcinoma rather than squamous cell carcinoma. Understanding these distinctions is crucial for recognizing and diagnosing skin cancer effectively.