Carcinoma:
Cancer that begins in the skin or in tissues that line or cover internal organs.

Basal Cells:
Small, round cells in the lower part (base) of the epidermis, the outer layer of skin.

Dermatologist:
Doctor with special training in diseases and conditions of the skin, hair and nails.

Squamous Cells:
Thin, flat cells in the surface of skin, the lining of hollow organs in the body and the passages of the respiratory and digestive systems.

Melanoma:
A form of skin cancer that begins in melanocytes (cells that make pigment). Usually begins as a mole.