Blisters are blisters. Blisters under the nose may be herpes simplex, traumatic blisters, prickly heat, etc. Patients can go to the hospital to find out the cause of the disease. 1. Herpes simplex: patients infected with type I herpes simplex virus, which can lead to the appearance of erythema and blisters under the nose, accompanied by a tingling sensation. 2. Traumatic blisters: patients with burns and other traumatic injuries resulting in the appearance of blisters under the nose, and at the same time there is a clarified liquid in the blisters, accompanied by a burning sensation and other symptoms. 3. prickly heat: patients who are in a hot, humid environment for a long time or have skin diseases caused by excessive sweating will also show up as something similar to blisters growing under the nose. When something like blisters grows under the nose, patients should not squeeze with their hands and pay attention to local hygiene to avoid infection. At the same time, it is recommended that patients go to the hospital in time for relevant examinations to clarify the cause of the disease, and then carry out targeted treatment.