A blister is a painful swelling on the surface of your skin. Blisters contain a clear liquid and are usually caused by heat or by something repeatedly rubbing your skin.
V-ERG
（使）（皮膚）長水皰
When your skin blisters or when something blisters it, blisters appear on it.
例句
The affected skin turns red and may blister...受感染的皮膚會變紅，還有可能起水皰。The sap of this plant blisters the skin.這種植物的汁液會使皮膚起水皰。