Removal of Melanocytic Nevi

Initial Assessment and Diagnosis

Before removal, any suspicious lesion should be photographed and thoroughly evaluated for concerning features that might suggest melanoma, as recommended by the British Journal of Dermatology 2
Complete excisional biopsy is preferred for suspicious lesions to allow for comprehensive histological assessment, according to the British Journal of Dermatology and other guidelines 2, 3
Diagnostic shave biopsies should be avoided for suspicious lesions as they may lead to incorrect diagnosis due to sampling error and make accurate pathological staging impossible, as stated by the British Journal of Dermatology 2, 4

For atypical (dysplastic) nevi with mild to moderate atypia and positive margins after initial biopsy, observation may be acceptable as an alternative to reexcision, with studies showing low short-term recurrence rates, as reported by the Journal of the National Comprehensive Cancer Network 6, 7
For severe dysplasia or if the atypical nevus is the only one of its kind, conservative reexcision with 2-5 mm margins is preferred, according to the Journal of the National Comprehensive Cancer Network 6, 7
Surgical excision with histologically negative margins is the first-line treatment for suspicious or confirmed melanoma, with margins based on tumor thickness, as recommended by the American Academy of Dermatology 1

For facial nevi, Mohs micrographic surgery or staged excision with permanent sections may be utilized for melanoma in situ, lentigo maligna type, on the face, ears, or scalp, as recommended by the American Academy of Dermatology 1
For subungual lesions, excision should be performed by experienced surgeons with adequate exposure of the nail matrix, as stated by the British Journal of Dermatology 2, 4
Distal phalangeal amputation is generally well-tolerated compared to nail bed excision with skin grafting, which may result in persistent sensitivity issues, as reported by the Journal of the National Comprehensive Cancer Network 5, 6

Avoid diagnostic shave biopsies for suspicious lesions as they compromise accurate diagnosis and staging, as stated by the British Journal of Dermatology 2, 4
Avoid partial removal of melanocytic nevi as this may result in pseudomelanoma (clinical and pathological picture resembling melanoma), as warned by the British Journal of Dermatology 2, 4
For melanomas arising in a congenital or atypical nevus, ensure removal of both the melanoma with appropriate margins and the entirety of the residual nevus, as recommended by the Journal of the National Comprehensive Cancer Network 6, 7

Patients with atypical mole phenotype or previous melanoma should be taught self-examination, as recommended by the British Journal of Dermatology 2
Patients with giant congenital pigmented nevi require long-term follow-up due to increased risk of melanoma, as stated by the British Journal of Dermatology 2