An Atypical Nevus (also called a Dysplastic nevus) is a benign growth that may share some of the clinical or microscopic features of melanoma, but is NOT a melanoma or any form of cancer. However, the presence of atypical nevi may increase the risk of developing a melanoma, or be a marker for someone who is at risk of developing Malignant Melanoma. This increased risk varies from very small for those with a single Atypical Nevus to higher for those with many.
Where do Atypical Nevi occur?
Atypical nevi can occur anytime on the body and usually begin to appear at puberty. These Nevi may however, be more common in sun-exposed areas including the back and legs.
What does it mean if I have a single Atypical Nevus?
The lifetime risk of a person in the U.S. developing melanoma in 1 in 75. A patient with one to four atypical nevi, without a personal or family history of melanoma, is at a higher risk than the general population. However, an Atypical Nevus is NOT the same as Malignant Melanoma. It does not need to be treated aggressively, but should be observed for changes, biopsied, or conservatively excised.
What can I do to prevent the development of Melanoma?
Ultraviolet light avoidance is important to help prevent development of melanoma. Outdoor activity should be avoided between late morning and early afternoon, tanning parlors should be shunned, and wide brimmed hats should be worn year round along with other protective clothing. Regular use of sunscreen (SPF 15 or higher) is advised, even for brief exposure to sunlight. Sunscreen should be re-applied every 1-2 hours in prolonged sun exposure. All of these precautions can be important steps to preventing skin cancer from developing.
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