Overview
Did you know your skin is your body’s largest organ? It’s a protective barrier that helps keep your other organs safe inside, while keeping germs, water and other substances out. And it helps you regulate body temperature.
Types of Skin Cancers
When cancer develops in one of the three types of skin cells (basal, melanocytes and squamous cells), it’s called skin cancer.
There are three main types of skin cancer, each named for the cells it grows in:
- Basal cell carcinoma—the most common type of skin cancer, it usually occurs where your body gets the most sun exposure, such as the face or neck, and may look like a shiny, pearly bump. Or basal cell carcinoma can show up as a flesh-colored or brown patch that resembles a scar.
- Melanoma—can develop anywhere on the body of people with all skin tones. It can appear on skin not normally exposed to the sun, such as the soles of your feet, underneath your fingernails or in your genital area. And it can grow in an existing mole, causing that mole to become cancerous. Melanoma may look like a large, speckled brown spot, or a colored spot (blackish-blue, white or red) with irregular borders.
- Squamous cell carcinoma—usually occurs on the parts of your body with the most sun exposure. It may look like a red lump or a flat spot with a crusty surface. Squamous cells serve as your skin’s inner lining.


