Basal cell degeneration seen in -
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
Anatomy of skin
Lichen Planus
Psoriasis
pemphigus
Pemphigoid
Lichen Planus