Basal keratinocyte herniation.
Basal cell herniations, i.e. basal keratinocyte processes protruding through basal lamina gaps were observed in psoriasis, circinate balanitis, pityriasis rubra pilaris, patch tests, gold dermatitis and conjunctivitis. This indicates that they are not specific to psoriasis and tumours as has been reported.
D001485:Basement Membrane / Q000648:ultrastructure; D004817:Epidermis / Q000648:ultrastructure*; D006801:Humans; D012871:Skin Diseases / Q000473:pathology*