About non-melanoma skin cancer

Squamous cell and basal cell skin cancers are known as non-melanoma skin cancer. Squamous cell skin cancer starts in the squamous cells (thin flat cells found on the surface of the skin). Basal cell skin cancer starts in the basal cells (round cells that lie under the squamous cells).

Squamous cell cancer and basal cell cancer are the most common types of skin cancer. They can occur in both men and women and they can usually be treated successfully.

More about non-melanoma skin cancer

What causes non-melanoma skin cancer




About melanoma skin cancer

Melanoma is a cancer that most often starts in the skin. Melanoma is less common than squamous cell and basal cell skin cancers, but it's the most dangerous form of skin cancer.

Melanoma can start in other places in the body where melanocytes are found, such as the eyes, the mouth, the vagina or under the fingernails. These types of melanoma are rare.

When skin is exposed to the sun, the melanocytes make more melanin and cause the skin to tan or darken. Sometimes melanocytes cluster together and form moles (called nevi). Moles are common and are usually not cancerous.

More about melanoma

What causes melanoma

melanoma on upper arm


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