Most people have moles, which are also known as nevi. Atypical nevi are unusual moles that are generally larger than normal moles, variable in color, and often have irregular borders.
Atypical moles occur most often on the upper back, torso, lower legs, head and neck. It is important to recognize that atypical moles are not limited to any specific body area — they can occur anywhere, including the feet, hands, scalp, and genital area.
The presence of atypical moles is an important clinical risk factor for melanoma developing in a mole or on apparently normal skin.