Lichen Planus Pigmentosus Inversus: A Case Series

Lichen planus pigmentosus inversus (LPPI) is a rare lichen planus pigmentosus inversus (LPPI) form that appears as brown macules, papules, or reticulated hyperpigmentation in the flexuaral and intertriginous areas. Generally, the lesions are asymptomatic. The disease has no effect on the mucosae, scalp, and palmoplantar areas. Ashy dermatosis, mycosis fungoides, occupational dermatoses, and drug-induced dermatoses are among the LPPI differential diagnoses. For LPPI, there is no particular treatment available. Dermatologists should be aware of this unusual LPP variation. As far as we know, 27 cases have been documented around the world. We would like to provide four more cases of this unusual illness in Arabic patients, together with a review of the literature, in this study.