There are many blisters on the mouth, probably herpes simplex virus infection. Herpes simplex virus is generally divided into herpes simplex virus type I and herpes simplex virus type II. Herpes simplex virus type I is more likely to infect lips, while herpes type II mainly infects genitals.

Once herpes virus is infected, it is difficult to be completely eliminated from the body. It will lurk in the nerve roots and attack when the body's immunity drops.

Therefore, in daily life, we must pay attention to enhancing immunity. Use antiviral drugs such as acyclovir, valaciclovir and famciclovir in time when herpes virus infection occurs. Drug treatment can shorten the course of disease and control symptoms.