Atypical mole syndrome, also termed as dysplastic nevus syndrome, Atypical moles are moles which are regarded to be precancerous or more likely to turn into melanoma than regular moles. The skin cells which make pigment (melanocytes) betimes group together to form moles. Most people have at least 10 moles on their bodies. Some people have 10-20 moles over their bodies.

People with this syndrome normally have more than 100 moles, at least some of which are unusual (atypical) in size and structure. Atypical mole syndrome is believed by some clinicians to be a progenitor or forerunner of malignant melanoma. This type of cancer may spread to contiguous parts of the skin or, through the blood and lymph circulation, to other organs.

Atypical moles may occur at any age and in all ethnic clumps. Atypical moles are at higher risk of turning into melanoma as collated to normal moles. Melanoma is a virulent form of skin cancer which kills quickly if not removed in time. Exposing the skin to sunlight is supposed to lead to the development of atypical moles. Atypical moles frequently run in families. People with atypical moles may also have a lineage history of melanoma.

Atypical moles may be darker brown in the midst or on the edges. People having atypical-nevus syndrome may have hundreds of moles of varying sizes and colors. The only secure way to remove an atypical mole is to have it cut out. Preventive measures, such as avoiding skin exposure to sunlight during peak sun hours, wearing protective clothing.