Bullous pemphigoid is an autoimmune disease that causes blistering of the skin.
Bullous pemphigoid occurs more often in men over age 60 but can occur in children. It is a less serious disease than pemphigus vulgaris (which also causes blistering—see Pemphigus Vulgaris), is not usually fatal, and does not result in widespread peeling of skin. It can involve a large portion of the skin, however, and can be very uncomfortable.
Although the cause is unknown, drugs (such as furosemide, spironolactone, sulfasalazine, antipsychotic drugs, and penicillin), physical causes (such as radiation therapy for breast cancer and ultraviolet radiation), and certain disorders (such as diabetes, rheumatoid arthritis, ulcerative colitis, and multiple sclerosis) may be causes.
In bullous pemphigoid, itchiness is often the first symptom. Before blisters appear, large, raised areas may develop, sometimes as hives. The immune system eventually forms antibodies directed against the skin, resulting in large, tense, and very itchy blisters surrounded by areas of normal-appearing skin or red, inflamed skin. Blisters commonly develop on the parts of the body that are able to flex, such as the backs of the knees, the underarms, the insides of the elbows, and the groin. Blisters in the mouth are rare.
Doctors usually recognize bullous pemphigoid by its characteristic blisters. However, it is not always easy to distinguish it from pemphigus vulgaris and other blistering conditions, such as severe poison ivy. Bullous pemphigoid is diagnosed with certainty by examining a sample of skin under a microscope (skin biopsy). Doctors differentiate bullous pemphigoid from pemphigus vulgaris by noting the layers of skin involved and the particular appearance of antibody deposits.
Prognosis and Treatment
Without treatment, bullous pemphigoid usually resolves after 3 to 6 years but can be fatal in about one third of older, debilitated people. Death seems to be more common among people who are treated with high doses of corticosteroids.
Initially, doctors give people potent corticosteroid creams to apply directly to the skin. These creams may reduce the need for drugs taken by mouth. People who have blisters on large portions of skin often need the corticosteroid prednisone taken by mouth, which is gradually reduced (tapered) after several weeks. Most people are symptom-free after 2 to 10 months.
The combination of nicotinamide and minocycline or tetracycline is sometimes successful in treating bullous pemphigoid. Other drug options include treatment with only dapsone, sulfapyridine, or erythromycin. Sometimes, drugs that suppress the immune system, such as azathioprine, mycophenolate mofetil, rituximab, or cyclophosphamide, are given to people with severe disease that does not respond to other treatment. Immune globulin given by vein (intravenously) is used occasionally. Although some local skin care may be needed, most people do not require hospitalization or intensive skin care treatment.
Last full review/revision August 2013 by Daniel M. Peraza, MD