Hello. Welcome to ask the doctor.
I understand your concern.
Blisters on lip are most likely due to viral infection known as Herpes labialis.
It is caused by Human herpesvirus 1 most of the times.
For this, I prefer to advise oral antivirals like Acyclovir / Valacyclovir.
Also topical antibiotic cream like mupirocin 2 percent over the affected area is advised.
I would like to advise you to visit your doctor so that he can examine you and give you prescription.
You can share my opinion with him.
I hope it helps.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.