A series of blisters under the nose may be related to diseases such as herpes simplex and herpes zoster. 1. Herpes simplex: a skin disease caused by infection with the herpes simplex virus, which is mainly manifested in the clinic as a dense or scattered distribution of small blisters, localized slight itching and burning sensation. 2. Herpes zoster: is due to infection with varicella zoster virus and lead to a skin disease, in the clinic is mainly manifested as a band-shaped distribution of small blisters, and localized burning sensation and pain. Due to individual differences, the specific circumstances need to ask the doctor for an interview, and then only to be able to clarify the cause of the disease.