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dysplastic naeviDysplastic Nevi (Atypical Moles) are unusual benign moles that may resemble melanoma. People who have them are at increased risk of developing single or multiple melanomas. The higher the number of these moles someone has, the higher the risk; those who have 10 or more have 12 times the risk of developing melanoma compared to the general population. Dysplastic nevi are found significantly more often in melanoma patients than in the general population.

Medical reports indicate that about 2 to 8 percent of the Caucasian population have these moles. Heredity appears to play a part in their formation.

Those who have dysplastic nevi plus a family history of melanoma (two or more close blood relatives with the disease) have an extremely high risk of developing melanoma. Individuals who have dysplastic nevi, but no family history of melanoma, still face a 7 to 27 times higher risk of developing melanoma compared to the general population–certainly a great enough risk to warrant monthly self-examination, regular professional skin exams and daily sun protection.

Normal Moles and Melanoma

Normal Moles are common small brown spots or growths on the skin that appear in the first few decades of life in almost everyone. They can be either flat or elevated and are generally round and regularly shaped. Many are caused by sun exposure.

Melanoma, one of the deadliest forms of skin cancer, most often appears as an asymmetrical, irregularly bordered, multicolored or tan/brown spot or growth that continues to increase in size over time. It may begin as a flat spot and become more elevated. In rare instances, it may not be pigmented.

“Classic" Atypical Mole Syndrome

Some people are so affected by both normal and atypical moles that they are classified as having atypical mole syndrome. They are at exceptionally high risk of developing melanoma. People with “classic” atypical mole syndrome have the following three characteristics:

At exceptionally high risk of developing melanoma are those with familial atypical multiple mole melanoma syndrome (FAMMM). These individuals not only have atypical mole syndrome, but also have one or more firstor second-degree relatives with melanoma. While atypical moles often arise in childhood, they can appear at any time of life in people with FAMMM.

Warning Signs and Images

People with dysplastic nevi and a family history of dysplastic nevi and melanoma tend to develop the cancer at an earlier age than melanoma patients who don’t have such nevi. Individuals who have dysplastic nevi but no family history of dysplastic nevi and melanoma may also develop melanoma at a relatively early age, but less often.

At times it is difficult to distinguish between dysplastic nevi and early melanomas. (Sometimes, melanomas will begin within a dysplastic nevus.) To establish the difference, a doctor will remove the entire spot or a portion of it for examination in the pathology laboratory. Some physicians recommend examining the mole with a dermoscope, which magnifies and allows visualization of internal structures and colors not seen by the naked eye.


Prevention Guidelines

Anyone who has an increased risk of developing melanoma must be particularly vigilant. Do any of these risk factors apply to you: light eyes, hair, and/or skin; freckles; many moles; personal or family history of melanoma or nonmelanoma skin cancer; sun sensitivity; inability to tan; repeated and intermittent sunburns; a very large mole present at birth, or dysplastic nevi?

The best advice is "Know your skin." Each family member should become aware of all moles on his/her total skin surface to minimize the risk of melanoma progressing to life-threatening stages. Anyone, especially someone with an increased risk of developing melanoma, should:

Suggestions for People with Dysplastic Nevi

If your doctor suspects dysplastic nevi, one or more moles may be biopsied - removed in a minor surgical procedure for microscopic examination. It is not necessary to remove all dysplastic nevi. However, if moles show significant change or signs of melanoma, or if new moles appear after age 40, they may be considered for removal by your physician.

When the diagnosis of dysplastic nevus is confirmed microscopically, it is advisable to:

With regular self-examination, professional examination, and common sense, you greatly reduce your chances that a melanoma will grow to a threatening size before it can be detected and removed.

Preventing Skin Cancer

While skin cancers are almost always curable when detected and treated early, the surest line of defense is to prevent them in the first place. Here are some sun safety habits that should be part of everyone's daily health care: