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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. [ABSTRACT FROM AUTHOR]

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A 69-year-old lady presented with asymptomatic hyperchromic macules located in the axillary and inguinal folds of six months of evolution. Skin biopsy confirmed the histological pattern of lichen planus leading to diagnosis of Lichen planus pigmentosus inversus (LPPI). She also had white striations of oral lichen planus along the dorsum of the tongue. LPPI is a very rare variant of lichen planus. As far as we know, none of the previously reported patients had coincident lesions on oral cavity. Our case adds one more report of LPPI to the known literature also adding a newness to what was known which is the presence of mucosal lesions in this variant. [ABSTRACT FROM AUTHOR]

A 35-year-old man was referred to our hospital with a 3 months history of itchy cutaneous eruption on the trunk and asymptomatic cutaneous eruption on both groins. Physical examination revealed several, purplish-brown, scaly papules on the trunk and well-circumscribed, brown patchs in a linear distribution, on the bilateral inguinal regions. Dermoscopic examination of papules on the trunk revealed white crossing lines surrounded by brown dots; dermoscopic examination of patchs on groins revealed gray-brown dots and globules. According to histological, dermoscopical and clinical changes, the diagnoses of classical lichen planus (LP) for the lesions on the trunk; and lichen planus pigmentosus inversus (LPPI) for the lesions on the inguinal regions were made. Inhere we have described a rare case of LPPI and classical LP with dermoscopic features; and we suggest that LPPI is a variant of classical LP. [ABSTRACT FROM AUTHOR]