A red pimple on the waist can be relieved and treated by daily care, medication and physical methods, but due to more causes of a red pimple on the waist, such as: herpes zoster, contact dermatitis, pimple urticaria and so on, the specific treatment needs to be selected according to the cause of the disease. 1. Herpes zoster: loose and comfortable cotton clothing should be worn to reduce local friction and keep the skin clean and dry. Under the guidance of professional physicians, choose to use vasiclovir hydrochloride tablets, acyclovir tablets and other drugs, can also be carried out in the form of local heat therapy to promote the subsidence of the rash. 2. Contact dermatitis: avoid contact with allergens and change clothes in time. You can choose to take oral benadryl tablets, loratadine tablets, etc., and use pimecrolimus cream, tacrolimus cream and other drugs under the guidance of professional physicians. 3. Pemphigus urticaria: pay attention to the hygiene of personal surroundings, choose to use glycerine lotion, mupirocin ointment, oral loratadine tablets, cetirizine hydrochloride tablets and other drugs under the guidance of a professional doctor for treatment. It is recommended to go to the hospital in time for examination and diagnosis, to clarify the cause of the disease, and to carry out targeted treatment under the guidance of professional physicians to avoid aggravation of the condition.