Blisters are also known as blisters, and long blisters in the middle of the person are mostly related to herpes simplex, insect bite dermatitis, chicken pox and other causes. 1. Herpes simplex: Herpes simplex is a skin disease caused by the herpes simplex virus infection, usually manifested as a cluster of blisters, accompanied by a burning sensation, tingling sensation, so the blisters in the middle of the human body may be caused by herpes simplex. 2. Insect bite dermatitis: Insect bite dermatitis is an inflammatory disease caused by insect bites on human skin, which can lead to blisters in the middle of the body. 3. Chickenpox: Chickenpox is an infectious skin disease caused by varicella zoster virus infection, which can cause blisters all over the body, so blisters in the middle of the human body may also be caused by chickenpox. Since there are many reasons for blisters in the middle of the human body, it is recommended to consult a doctor in time to clarify the cause of the disease and follow the doctor’s instructions to standardize the treatment.