Herpes on thighs may be shingles or herpes simplex, which is contagious. 1. Herpes zoster: Herpes zoster is caused by varicella-zoster virus infection, which is an acute infectious skin disease. After the initial infection with varicella-zoster virus, the virus enters the body and lurks in the ganglia, and the body’s immunity is low, the virus will be re-activated, inducing infection. Under normal circumstances, herpes zoster is contagious and enters the body from the nasal mucosa. 2. Herpes simplex: Herpes simplex is a common clinical viral infection, caused by herpes simplex virus infection, such as herpes simplex virus type I, mainly through oral secretions or lip ulcers for transmission. Type 2 herpes simplex, mainly spread through sexual contact. Herpes on the legs, usually caused by viral infections, is somewhat contagious. It is recommended to pay attention to daily care, but also to the hospital dermatology department, a clear diagnosis, for the cause of the appropriate drug treatment.