Bullous pemphigoid

Bullous pemphigoid is a chronic skin condition that mainly affects older adults. It involves the immune system mistakenly attacking the skin, causing large, tense blisters to form. These blisters usually appear on the arms, legs, and abdomen and can be itchy or painful. The condition affects the skin's outer layers, leading to discomfort and potential skin damage. It is not contagious and typically develops slowly over weeks to months. Managing the symptoms often requires medical treatment to reduce inflammation and prevent new blisters.

Bullous pemphigoid is an autoimmune subepidermal blistering disorder characterized by autoantibodies targeting hemidesmosomal proteins BP180 and BP230 in the basement membrane zone. This immune attack leads to separation of the epidermis from the dermis, resulting in tense, pruritic bullae predominantly in elderly patients. The pathogenesis involves IgG autoantibodies and complement activation causing inflammation and blister formation. Clinically, it presents with widespread tense blisters on erythematous or normal skin, often accompanied by urticarial plaques. It is distinguished from pemphigus vulgaris by the level of skin cleavage and the absence of mucosal involvement in most cases. The disease is significant due to its chronic course and potential complications from skin barrier disruption.