In clinical treatment of herpes on the arm, the first step is to improve the immune capacity of the body. If the patient is weak and sickly, he or she needs to be given thin glucose peptide injection or sodium deoxynucleotide injection. If the patient has a serious medical condition, such as type 2 diabetes or cerebral thrombosis, he or she needs to be treated actively with hypoglycemic and lipid-lowering therapy, and at the same time antiviral drugs such as acyclovir injection or oral famciclovir tablets can be chosen. Herpes on the arm can be caused by herpes simplex due to herpes simplex type 1 virus infection, or herpes zoster due to varicella zoster virus infection, both of which are caused by a decrease in the immunity of the patient’s body to the virus.