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Nevi are skin lesions that often begin to grow in childhood (occasionally, they are congenital) and have appeared on the skin by early adult life. The most common types are freckles and common moles (nevi). Depending on may go unnoticed – or they may become a nuisance by
rubbing against clothing and getting in the way of shaving. |
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Normal nevi
- appear 6 to 12 months after birth
- Expand in proportion to body growth
- Smaller than 5 mm in diameter
- Evenly pigmented or symmetrically speckled tan or brown
- Discrete, well-demarcated, smooth borders
- Number 10 to 40; scattered over the entire body
- Enlarge and increase in number during childhood and puberty
- More prominent during pregnancy
- Present on sun-exposed surfaces above the waist
- Do not appear on the scalp, breast, and buttocks
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Atypical (dysplastic) nevi
- Intermediate between acquired moles and melanoma (gross and microscopic appearance)
- Greater than 5 mm in diameter
- Raised in the center and flat at the edges
- Darkly or irregularly pigmented
- Multiple shades of brown of pink
- Irregular borders, with notches, fade into the surrounding skin
- Single or multiple (max exceed 100)
- Look very different, one from the other
- Seen on sun-exposed areas—the back is the most common site
- Occur below the waist and on the scalp, breast, and buttocks
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Dysplastic nevi can be identified clinically as mild, moderate, or severe.
A severely dysplastic nevus is indistinguishable from early melanoma. |
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Malignant melanomas
- Asymmetric, irregular borders (scalloped, notched, or angular)
- Mixture of variegated colors (tan, brown, pink, white, or dark black)
- Pigments spread into the surrounding skin
- Usually at least 5 mm in diameter (often much larger)
- Abnormal surface (scaling, crusting, oozing, or bleeding)
- Symptoms of itching, pain, tenderness
- Surrounded by abnormal skin (erythematous, inflamed, altered pigmentation)
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©Jozef Tryzno, MD, RVT, FASA , FASLMS, International Vein & Skin Institute. All Rights Reserved. |
