What to do if i have fever blister, please help me?

Nothing: It will heal in a week or 2. Prescription acyclovir or valacyclovir pills are effective if given at once. After a few hours it does not matter what you do. OTC and prescription creams are not worth the money. Some people have them several times a year so they learn to carry this med to take at very first start of next attack. Then it is usually very effective. I like Valacyclovir 1 Gram tabs to ta