Herpes zoster is a viral infection, which usually results in erythema and blisters on the skin, and itchy skin after it gets better. If you have itchy skin, you can’t scratch with your hands, you can’t wash with hot water, and you can’t eat seafood, acid, spicy, fish, shrimp, wine and other fishy things. You can apply topical furnace glycolic lotion to relieve itching, 3 times/day, and take oral anti-allergic drugs, such as levocetirizine hydrochloride dispersible tablets, 5 mg/time, 1 time/day, or oral olopatadine hydrochloride tablets, 2 times/day, 1 tablet/time. You can also use traditional Chinese medicine for external washing, which has anti-itching effect, such as dehumidification and anti-itching lotion or Sanwei Qinghe anti-itching lotion, diluted 20 times with water, 2 times/day, 3-5 minutes each time.