Most of the blisters around the mouth after a cold are related to perioral herpes caused by herpes simplex virus infection.
When the body’s immunity is lowered during a cold, it is susceptible to a combination of multiple pathogen infections, and when infected with herpes simplex virus and herpes zoster virus, perioral herpes can occur, manifesting itself as blisters, burning sensation, and pain around the mouth.
Herpes simplex virus and herpes zoster virus can also lurk in the body and recur when the immune system is lowered, again causing the above symptoms.
Herpes around the mouth after a cold is recommended to consult a doctor in time, complete the relevant auxiliary examination under the guidance of specialists to treat the cause.