Dense blisters on the lips are mainly caused by vitamin deficiency, viral infection and weak immunity of the body. A decrease in immunity can cause viral infections, especially small blisters on mucous membranes such as the lips, which can be reduced or disappeared by improving immunity and supplementing with fresh fruits and vegetables. Blisters on the lips are self-limiting infections that can heal themselves in about 1 week, so there is no need to worry too much. Paying proper attention to eating less greasy things in the usual diet can prevent the so-called fire symptoms in Chinese medicine and make the condition improve faster, and proper exercise to improve the body’s immunity can help prevent and treat blisters on the lips.