Blisters are medically referred to as blisters, and blister-like rashes may be caused by eczema, herpes simplex, herpes zoster, and other diseases. 1. eczema: a rash like blisters, may be caused by eczema, eczema acute phase of the severity of small blisters, often fused into a piece, the boundary is not clear, the lesions around the pimples gradually sparse, often due to scratching the formation of punctate vesicles, there is a clear plasma oozing. 2. Herpes simplex: caused by herpes simplex virus (HSV), clinically characterized by clustered blisters, self-limiting, but prone to recurrence, is one of the most widespread infectious diseases in the world. 3. herpes zoster: herpes zoster lesions often first appeared erythema, soon appeared corn grain to soybean papules, cluster distribution without fusion, followed by rapid change into blisters, blister wall tense shiny, blister liquid clarification, peripheral around the red halo, the cluster blisters between groups of normal skin. The lesions are arranged in bands along a peripheral nerve, mostly on one side of the body. Rash like blisters may also be caused by other diseases, need to cooperate with the doctor to improve the relevant examination to determine the cause, and then do targeted treatment and treatment.