Interface Dermatitis
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Interface (Dermal-Epidermal) dermatitis
       Lichenoid
               Basal keratinocyte necrosis & Colloid bodies
                       Lichen Planus
                               3Ps: Pruritic, Purple & Polygonal Papule
                       Lichenoid drug eruption
       Vacuolar
               Vacuoles in basal keratinocytes
                       Lupus
                               Granular C3 & IGg@ dermal-epidermal junction
                       Acute GVHD
                               Apoptotic keratinocytes
                       Lymphomatoid papulosis