<P> There are also a number of medical conditions that cause blisters . The most common are chickenpox, herpes, impetigo, and a form of eczema called dyshidrosis . Other, much rarer conditions that cause blisters include: </P> <Ul> <Li> Bullous pemphigoid: a skin disease that causes large, tightly filled blisters to develop, usually affecting people over the age of 60 . </Li> <Li> Pemphigus: a serious skin disease in which blisters develop if pressure is applied to the skin; the blisters burst easily, leaving raw areas that can become infected . </Li> <Li> Dermatitis herpetiformis: a skin disease that causes intensely itchy blisters, usually on the elbows, knees, back and buttocks . The blisters usually develop in patches of the same shape and size on both sides of the body . </Li> <Li> Chronic bullous dermatosis: a disease that causes clusters of blisters on the face, mouth or genitals . </Li> <Li> Cutaneous radiation syndrome </Li> <Li> Epidermolysis bullosa </Li> </Ul> <Li> Bullous pemphigoid: a skin disease that causes large, tightly filled blisters to develop, usually affecting people over the age of 60 . </Li> <Li> Pemphigus: a serious skin disease in which blisters develop if pressure is applied to the skin; the blisters burst easily, leaving raw areas that can become infected . </Li>

Generally the most important treatment for a liquid chemical burn is to