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Melanoma |
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Melanoma is a disease in which malignant (cancer) cells form in the skin cells called melanocytes (cells that color the skin). Melanocytes are found throughout the lower part of the epidermis. They produce melanin, the pigment that gives skin its natural color. When skin is exposed to the sun, melanocytes produce more pigment, causing the skin to tan, or darken. The skin is the body’s largest organ. It protects against heat, sunlight, injury, and infection. The skin has 2 main layers: the epidermis (upper or outer layer) and the dermis (lower or inner layer). When melanoma starts in the skin, the disease is called cutaneous melanoma. This PDQ summary is about cutaneous (skin) melanoma. Melanoma may also occur in the eye and is called intraocular or ocular melanoma. (Refer to the PDQ summary on Intraocular (Eye) Melanoma Treatment for more information.) There are 3 types of skin cancer: Melanoma. Basal cell skin cancer. Squamous cell skin cancer. Melanoma is more aggressive than basal cell skin cancer or squamous cell skin cancer. (Refer to the PDQ summary on Skin Cancer Treatment for more information on basal cell and squamous cell skin cancer.) Melanoma can occur anywhere on the body. In men, melanoma is often found on the trunk (the area from the shoulders to the hips) or the head and neck. In women, melanoma often develops on the arms and legs. Melanoma usually occurs in adults, but it is sometimes found in children and adolescents. Unusual moles, exposure to sunlight, and health history can affect the risk of developing melanoma. |
