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
Lichen Planus
Psoriasis
pemphigus
Pemphigoid
Anatomy of skin