Lichen planus pigmentosus-inversus: A report of two cases

Abstract

Lichen planus pigmentosus (LPP)-inversus has been identified in a few East European cases primarily intertriginous areas such as axilla and groin which is not contacting with sunlight, and involvement in other skin areas was rarely detected. Because the lesions are similar to LPP in clinical and histological appearance, this condition, which is characterized by hyperpigmented, brown macules or plaques, is called LPP-inversus. Until today, actinic LP, linear LP, zosteriform, and LP pigmentosus clinical subtypes of lichen planus have been described. LPP-inversus is a rare form of LP and so far, there have been few case reports. LPP-inversus has been reported mostly in Caucasians and Asians, and axilla was the most involved body region. In a small proportion (approximately 10%) of the cases, classical LP or LPP lesions may be located outside the flexural areas. So far, about 50 cases have been reported; also we presented two new cases that we diagnosed.