What type of skin cancer arises from the squamous cells?

Squamous cell carcinoma (SCC) arises from squamous cells, which are flat cells located in the outer layer of the skin, known as the epidermis. This form of skin cancer commonly develops in areas that are exposed to the sun, such as the face, ears, neck, and hands, but it can also occur in other locations on the body.

Understanding that squamous cells are part of the skin’s structure is crucial; they play a key role in protecting the body from environmental factors. When these cells undergo malignant transformation due to excessive UV exposure, genetic predispositions, or other carcinogens, SCC can develop, often presenting as a firm, red nodule or a flat sore with a scaly crust.

The other types mentioned do not originate from squamous cells. Melanoma originates from melanocytes, the pigment-producing cells of the skin. Basal cell carcinoma originates from basal cells found in the deepest layer of the epidermis, while adenocarcinoma arises from glandular cells and is not a type of skin cancer that originates from squamous cells. Therefore, squamous cell carcinoma is the correct answer as it specifically reflects a malignancy that arises from the squamous cell layer of the skin.