By Gary M. White, MD
Lichen planus pemphigoides presenting preferentially over preexisting scars: A rare instance of isotopic phenomenon. Indian J Dermatol 2015;60:596-9
Leukemia Cutis. Has been reported to infiltrate minor scars [JD 18;281;1991].
Sarcoidosis. From JAAD June 2014 Volume 70, Issue 6, Pages e119–e120.
Cutaneous Silica Granuloma
Pigmented Streak. This benign pigmented macule is common in scars that stretch.
Recurrent Melanoma. This was a recurrent lentigo maligna in the scar after previous excision.
Recurrent Nevus. The recurrent nevus is the benign return of pigment in a partially removed mole. Of course, biopsy is often in order to confirm the diagnosis and exclude atypia/melanoma.
Monsel's Tattoo. Courtesy Michael O. Murphy, MD
Recurrent Basal Cell Carcinoma
Lichen Sclerosus. Rarely, LSA may develop in an old scar, e.g., from surgery, vaccination, or a thermal burn [JAAD 1994;31;671].
Necrobiosis Lipoidica. May rarely occur in scars [Dermatology Online Journal 22;6].
Marjolin's Ulcer. Rarely, squamous cell carcinoma may develop in an old scar or chronic wound.
Velvety skin in graft site. So called Ectopic Acanthosis Nigricans. Dermatología Argentina
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