Itchy blisters on the body may be herpes simplex, chickenpox, shingles and other diseases. 1. Herpes simplex: caused by the herpes simplex virus infection, herpes simplex will have burning, itching and other symptoms at the beginning, followed by clusters of pinhead-sized blisters, which can occur in all parts of the body. 2. Chickenpox: when chickenpox occurs, it is usually common in children, redness and swelling at the beginning, followed by blisters, papules, vesicles, etc., and finally the blisters rupture and crusting, and the patient may have fever, headache and other complications. 3. Herpes zoster: body itching blisters, can also be herpes zoster, the typical characteristics of this disease is neuralgia, can appear blisters, blister wall tense shiny, blisters within the liquid clarification, lesions were unilateral, band-like distribution. Body itching blisters, need to actively go to the dermatology department for diagnosis and treatment.