Herpes zoster is a contagious skin disease caused by the varicella-zoster virus. It is characterized by the appearance of erythema, blisters or papules on the skin, tired as beads, arranged in bands, appearing along one side of the peripheral nerve distribution area, with localized tingling pain. Most patients rarely recur after healing, but a very small number of patients may have multiple episodes. It can occur in all seasons. The disease is more common in adults and is especially severe in the elderly. It is also known as herpes zoster, herpes fire, herpes snake, herpes spider, etc. Why do adults get shingles? It is mainly related to the varicella-zoster virus, which first infects children and causes chickenpox. When the chickenpox is healed, the virus is not removed from the body, but is latent in the sensory nerve roots, and when the body’s immunity is low (such as fatigue, emotional changes, family changes, etc.), the virus becomes active again and invades along the nerves, causing nerve sheath damage and nerve inflammation.