Basal cell degeneration seen in -: (A) Lichen Planus, (B) Psoriasis, (C) pemphigus, (D) Pemphigoid
Answer is A. Lichen planus is an inflammatory T cell mediated autoimmune disorder affecting skin, hair, nails and mucous membranes. Lichen planus triggers T cell mediated autoimmune damage to basal keratinocytes that manifest as altered self antigens on their surface. Ref Harrison20th edition pg 1256