Lichen planus pigmentosus in systemic sclerosis: a rare association

A 30 year old female came to outpatient department with gradually progressing asymptomatic hyperpigmented lesions over face and neck since 2 years. Patient was a known case of systemic sclerosis and hypothyroidism and was on treatment for the same since 8 years. Differential diagnosis included lichen planus pigmentosus (LPP), ashy dermatoses, drug-induced hyperpigmentation, Riehl’s melanosis. Histopathology confirmed the diagnosis of lichen planus pigmentosus. Patient was put on topical depigmenting agents and topical calcineurin inhibitors along with photoprotection and the response was good. Patient had been regular in follow up.