Why does bullous pemphigoid cause skin blisters?

Skin Blisters is a common presentation of Bullous Pemphigoid. The immune reaction creates inflammation at the junction between skin layers, allowing fluid to collect in the space that forms. Blisters may feel firm or tense because they begin beneath the top surface rather than within it. Itching can appear before the blisters, and nearby skin may look red, irritated, or hive-like. Bullous pemphigoid often affects older adults, but appearance alone cannot establish the diagnosis. A clinician may examine the skin and use a small sample or blood test to identify the immune pattern.

Keep blisters clean and avoid deliberately breaking them. If one opens, wash gently with clean water, pat dry, and cover it with a non-stick dressing. Do not apply steroid creams, antibiotics, or antiseptics unless a clinician has advised you how to use them. Arrange medical assessment for new, spreading, or recurrent blisters because treatment is aimed at calming the immune reaction and preventing new areas from forming. Tell the clinician about medicines you take and any mouth, eye, or genital soreness.

Seek urgent medical help if blisters involve the eyes or mouth, swallowing becomes difficult, breathing feels affected, or large areas of skin are raw. Prompt assessment is also needed for increasing warmth, pus, worsening pain, fever, or feeling faint, which can signal infection or significant fluid loss. Until you are seen, avoid scratching and keep open areas protected.

Could this be bullous pemphigoid or another blistering condition? Do I need a skin biopsy or blood test? Which treatment should I use on intact and open blisters? How should I protect my eyes and mouth? What changes should prompt urgent review?