Lichen planus is a pruritic, benign, papulosquamous, inflammatory dermatosis of unknown etiology that affects either or all of the skin, mucous membrane, hair and nail. In its classic form, it presents with violaceous, scaly, flat-topped, polygonal papules. A female patient aged 43 years with a history of pruritic eruptions for a period of one month over the right armpit and back of the right chest (C8, T1, T2, T3 Dermatomes). She had a history of herpes zoster in the same localization, which had been treated with topical and oral acyclovir two months prior to this visit. This variant may represent as an example of the Wolf’s isotopic response. We presented our case because of its rarity as a Dermatomal distribution of lichen planus pigmentosus (LPP) and its appearance in the area of healed herpes zoster as an isotopic response. The case well highlights this unusual condition and represents the first case reported in Indian dermatology literature to our best of knowledge. The clinical and histological features of this case are described here.