Dysplastic nevi, also known as atypical moles, are infrequent benign moles that may resemble melanoma. Dysplastic nevi are usually larger than commonly moles and have irregular and obscure borders. Dysplastic nevi are moles that are regarded to be precancerous or more likely to turn into melanoma than regular moles. The skin cells which make pigment (melanocytes) sometimes group together to form moles.

Most people have at least 10 moles on their bodies. Most people have 10-20 moles over their bodies. People with this disorder often have more than 100 moles, at least some of which are unusual (atypical) in size and structure. Dysplastic nevi syndrome is believed by some clinicians to be a precursor or forerunner of malignant melanoma.

This type of cancer may spread to adjoining parts of the skin or, through the blood and lymph circulation, to other organs. Dysplastic nevi s are at greater risk of turning into melanoma as compared to normal moles. Melanoma is a critical form of skin cancer which kills rapidly if not removed in time. Exposing the skin to sunlight is supposed to lead to the growth of dysplastic nevi.

Dysplastic nevi frequently run in families. People with atypical moles may also have a family history of melanoma. Dysplastic nevi may be darker brown in the center or on the edges. People with dysplastic nevi syndrome may have hundreds of moles of varying sizes and colors. The only secure way to remove an dysplastic nevi is to have it cut out. Protective measures, such as abiding skin exposure to sunlight during peak sun.