Blisters on the lips are medically known as “herpes labialis”, which is caused by a decrease in the immunity of the body to the herpes virus, such as stressful work, fatigue, prolonged late nights, or prolonged application of immunosuppressants, resulting in a decrease in the immunity of the body. For the treatment of herpes labialis: 1, pay attention to rest, do not stay up late, must go to bed before 11:00 p.m.; 2, temporarily do not strenuous exercise, after healing, you can strengthen physical exercise, enhance the body’s immunity; 3, we can supplement some vitamin C-rich food, such as orange juice and other kinds of juice, can also supplement a variety of vitamins; 4, the local treatment, you can Topical acyclovir ointment to speed up the healing of herpes labialis.