Immunologic bullous diseases: blisters without a precipitating event.

Although the overall incidence of immunologic bullous diseases is comparatively low, they are nonetheless potentially lethal dermatologic disorders that occur most commonly in individuals age 55 and older. Thus familiarity with the signs, symptoms, and treatments will be valuable to the primary care physician. For bullous diseases in general, the challenge is to differentiate between those arising from immunologic rather than exogenous causes, such as drug-induced or drug-triggered pemphigus. Treatment goals include screening for associated malignancies, managing the lesions, and minimizing the morbidity and mortality associated with the disease. Collaboration with a dermatologist can aid in achieving these objectives.