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pemphigoid (bullous pemphigoid) (pem-fig-oid) n. a chronic itchy blistering disorder of the elderly. The blisters most commonly occur on the limbs and persist for several days, unlike those of pemphigus. Pemphigoid is an autoimmune disease and responds to treatment with corticosteroids or immunosuppressant drugs. ocular p. a potentially blinding disease in which there is blistering and scarring of the conjunctiva and adhesions to the eyelid.