Eruptive Vellus Hair Cyst With Singular Histologic Finding

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Abstract
To the Editor.— Eruptive vellus hair cysts (EVHCs) were first reported by Esterly et al in 1977.1 Since then, several cases have been described, two of them involving familial affectation, which suggests an apparent autosomal dominant inheritance.2,3 Although clinical findings may be variable in age of onset, localization, and evolution, histologic studies are distinctive, consisting in all cases of a small cyst located in the midcorium with a wall composed of several layers of squamous cells and a cavity containing laminated and amorphous keratinous material and vellus hairs. Occasionally, the cysts are in continuity with hair follicles1,4,5 or arrector pili muscles,1,2 and, in some cases, one or more sebaceous glands were seen near the cyst.6,7 We describe herein a case of EVHC with sebaceous glands within the cyst wall, similar to those seen in steatocystoma. Report of a Case.— A 22-year-old woman was examined for

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