The first situation, if it is unilateral waist, such as the left or right side, to one side of the main and the other side of the rash, manifested as a erythema, there may be small blisters on top, a bunch of clusters of distribution, not more than the body surface midline, there may also be pain considered shingles. It is easy to get herpes zoster in spring and autumn when the immunity of the body is weakened, or when people stay up late or are stressed out. Herpes zoster is contagious, so people with low immunity such as the elderly and children at home should be isolated as much as possible and the home should be ventilated regularly to avoid the spread of herpes zoster. Treatment can be oral vaxilovir antiviral treatment, the herpes can basically dry up in 7-10 days. But herpes zoster may also have pain, you can take oral methylcobalamin to nourish the nerves, and analgesia to relieve pain. The second situation, a lot of pimples on the waist, if it is the case of both the waist and back, it can be considered folliculitis, folliculitis and acne is basically a meaning. The rash manifests itself as an erythematous spot that may have pustules on it, and there is usually a slight itching, or it may not. This situation can be topically applied fusidic acid or erythromycin anti-inflammatory can be. The actual fact is that you can find a lot of people who are not able to get a good deal on this kind of things.