Squamous Cell Carcinoma
They begin in the squamous cells found in the upper part of the epidermis, the top layer of skin.
Squamous cell carcinomas are most often found on skin that has been exposed to the sun on the face, ears, neck, lips and backs of the hands. However, they can also develop in a scar or in chronic skin sores.
They usually grow slowly, appearing as flat reddish patches in the skin. Or, they may develop as growing lumps, with a rough, scaly or crusted surface.
Squamous cells are more likely than basal cell carcinomas to spread to other parts of the body, such as the fatty tissues beneath the skin or to nearby lymph nodes, a collection of vessels that filter out harmful substances and germs.