What is squamous cell carcinoma?
Squamous cell carcinoma forms in the squamous cells of the epidermis (top layer of skin). Squamous cells are flat cells in the outer part of the epidermis that are constantly shed as new ones form.
Basal cell and squamous cell cancers are the most common skin cancers, and actually are more common than any other form of cancer. Because they rarely spread to other parts of the body, basal cell and squamous cell skin cancers are usually less concerning. On rare occasions, systemic treatment including immunotherapy might be used.
More information about squamous cell carcinoma (National Cancer Institute)