Blisters are known as blisters. Small blisters on the body after steaming may be caused by contact dermatitis, eczema and shingles. 1. contact dermatitis: patients in contact with their own allergic substances in the steam, a series of allergic reactions may occur, small blisters appear on the body and other adverse symptoms. 2. Eczema: patients sweating too long, in the process of sweating, the body of the small beads of sweat is not cleaned up in time, inducing the occurrence of eczema, resulting in patients in the sweating of small blisters on the body symptoms. 3. Herpes zoster: patients in the steam, may come into contact with patients suffering from herpes zoster, infected with varicella zoster virus, small blister-like herpes zoster on the body. When the patient in the steam, appeared in the body with small blisters, should immediately stop sweating, and timely to the hospital for examination and diagnosis, under the guidance of the doctor to choose the corresponding treatment.