Itchy blisters may be caused by chickenpox, herpes simplex, drug rash, insect bite dermatitis, eczema, etc. The disease is caused by chickenpox-herpes zoster virus infection. 1. Chickenpox: The disease is caused by varicella zoster virus infection, resulting in skin erythema, papules, pimples or blisters all over the body, and scabs can appear after the blisters are broken, which can cause blisters with itching symptoms. 2. Herpes simplex: the disease is caused by herpes simplex virus infection, often occurring in the lips, perineum and other skin and mucous membrane junction, can appear erythema, blisters, accompanied by itching symptoms. 3. drug rash: the disease is patients taking drugs caused by drug allergic reactions, can cause the whole body with erythema, papules, with itching, severe cases can appear blisters, blisters, epidermal detachment and other severe drug rash manifestations. 4. Insect bite dermatitis: when mosquitoes bite the skin, due to the mosquito secretion of acidic substances can cause skin allergy phenomenon, caused by biting parts of the wind like pimples, severe blisters, accompanied by intense itching or pain. 5. Eczema: the disease is due to internal and external stimulation of a variety of factors caused by inflammatory skin diseases, acute eczema may cause skin erythema, blisters, oozing, etc., so that the body blisters with the phenomenon of itching. Body blisters and itchy may also be caused by other diseases, patients need to go to the regular hospital in time to check, after a clear diagnosis under the guidance of the doctor standardized treatment.