Pigmented Intertriginous Lesions and Bullous Plaques: A Quiz

Żychowska, Magdalena; Batycka-Baran, Aleksandra; Maj, Joanna; Szepietowski, Jacek C.; Baran, Wojciech

doi:10.2340/00015555-2532

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2023

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“…This could explain the occurrence of skin lesions in intertriginous area [5]. Cases of co-occurrence of LPPI with hepatitis C virus infection [6], endocrinopathies, lichen planopilaris or other variants of LP have also been described [7,8]. The differential diagnoses include erythrasma, acanthosis nigricans, ashy dermatosis, postinflammatory hyperpigmentation, and fixed drug eruption [9].…”

Section: Discussionmentioning

confidence: 99%

Lichen planus pigmentosus inversus limited to the umbilicus — a case report with dermoscopic findings

Kołcz,

Ostańska,

Kosior

et al. 2023

Forum Dermatologicum

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Lichen planus pigmentosus inversus (LPPI) is a rare variant of lichen planus. Its etiopathogenesis is not fully understood. Koebner's phenomenon is considered to be a potential triggering factor, which may explain the localization of skin lesions in flexural and intertriginous areas that are not exposed to ultraviolet. A case of a 32-year-old female patient is reported, in whom the umbilicus was the only site involved by LPPI. Dermatoscopy revealed irregular pinkish structureless areas intermingled with whitish lines, grey dots, and a grey-black structureless area. The observed features did not allow a clear diagnosis. Due to the unknown duration of the lesions and technical difficulties with videodermoscopic monitoring, the lesion was excised with a 1-mm margin. Histopathological examination was consistent with the diagnosis of LPPI.

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