When a blister grows on the waist, one needs to look closely at the appearance of the blister to determine how the factor is formed. If such blisters are distributed unilaterally in a striped arrangement, accompanied by many symptoms such as pronounced burning, itching, numbness, and pain, it is considered possible that the infection is herpes zoster caused by the varicella-zoster virus. This disease is infectious and is a specific change caused by the metabolic proliferation process of the virus. If the blisters on the waist are arranged in a circular pattern and concentrated in the area where the waistband touches with intense itching, consider the possibility of contact dermatitis. It is a symptom triggered after contact with the trouser belt friction, and it is also related to the lowered immunity. If the blisters on the waist are isolated and accompanied by significant pressure pain and redness, it is considered possible that the insect bite dermatitis, also called papular urticaria, is caused by insect bites.