Serpentine is a term for herpes zoster, which is contagious and may infect people. People with the herpes zoster virus are the source of the disease, but it is generally believed that herpes zoster is primarily the result of reactivation of latent viruses in the body. Before the blisters appear, they are usually not contagious. After the blisters scab over, they are no longer contagious. Once the blisters are broken, the fluid in the blisters is highly contagious, so it is possible to infect others. The disease often occurs in immunocompromised people, such as people with AIDS, blood tumors, people receiving immunosuppressive drugs, and people with tumors receiving radiotherapy. Do not scratch and touch herpes, nor break the blisters or tear the scabs with your hands to prevent spreading the virus by touching other objects after hand contact. When herpes zoster appears, it is recommended to seek medical attention and targeted treatment or therapy.