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Lichen nitidus and morphea are common diseases, but an associated localization of both lesions is rare. Here, we describe the first case of lesions distributed along Blaschko's lines. A 24-year-old Japanese woman was referred to our clinic for evaluation of band-like plaques of 18-months history on the right lateral side of her abdomen. In addition, multiple milky-white papules were seen within the plaques. Histopathological examination showed there was sclerosis in the lower half of the dermis and well-circumscribed, dense, papillary dermal lymphohistiocytic aggregations showing a so-called "claw clutching a ball." Immunohistochemical analysis revealed that the morphea and lichen nitidus had similar characteristics. We speculated that unique immunologic events led to the development of lichen nitidus and morphea in our patient.

Lichen nitidus and morphea are common diseases, but an associated localization of both lesions is rare. Here, we describe the first case of lesions distributed along Blaschko's lines. A 24-year-old Japanese woman was referred to our clinic for evaluation of band-like plaques of 18-months history on the right lateral side of her abdomen. In addition, multiple milky-white papules were seen within the plaques. Histopathological examination showed there was sclerosis in the lower half of the dermis and well-circumscribed, dense, papillary dermal lymphohistiocytic aggregations showing a so-called "claw clutching a ball." Immunohistochemical analysis revealed that the morphea and lichen nitidus had similar characteristics. We speculated that unique immunologic events led to the development of lichen nitidus and morphea in our patient., identifier:http://www.lib.tottori-u.ac.jp/yam/yam/yam64-2/64-2contents.html, identifier:https://www.jstage.jst.go.jp/article/yam/64/2/64_2021.05.006/_article

Blaschkitis is an acquired, rare dermatosis distributed along the lines of Blaschko. The papulovesicular eruption generally resolves in weeks and shows minimal response to topical steroids. Herein, we present a case of blaschkitis in an adult male who had lesions present for one year, which showed significant improvement after two weeks of topical clobetasol ointment.

Blaschkitis is an acquired, rare dermatosis distributed along the lines of Blaschko. The papulovesicular eruption generally resolves in weeks and shows minimal response to topical steroids. Herein, we present a case of blaschkitis in an adult male who had lesions present for one year, which showed significant improvement after two weeks of topical clobetasol ointment.