Melanoma is a skin cancer that begins in the melanocytes, cells that produce moles. Healthy moles can be elevated or flat, brown or dark brown, of even shape and up to 1 cm in diameter. When a mole appears and reaches its size, it stops changing and remains the same throughout life. Dermoscopy is desirable once in 12 to 18 months. Moles with irregular shape can still be healthy, but in that case we call them atypical or dysplastic moles, and they should be followed and checked once every 6 months. This is the shortest period of time in which dysplastic mole can start changing into melanoma. The exceptions are lesions that are above the surface of the skin, similar to peas. We never follow such lesions because their cells change very quickly and sometimes a period of one month can be crucial.