Benign neoplasms of skin
Benign, can be acquired or sun exposure, peak in early adulthood
Most adult have about 20 nevi
Lesion usually <1cm, pigmented macules, papules or nodules
Evaluation of nevi from junctional (dermal-epidermal junction), compound (involves papillary dermis) and finally dermal nevi (into dermis, grows or remains intradermal).
Congenital nevi are presents at birth, usually not thought to be risk for melanoma .