Definitely donot pop cold sore or it is also called fever blisters. They are a partcular type of herpes. Donot freak out. It isnot the herpes that attacks the genital area. You asked about ZoviraceIt may be obtained in a drug store, You will need a prescription. It is expensive, but worth the price. If you use something over the counter called Abreva as someone else reccomended. Follow the advice of others and do not pop. As with any blisters, donot pop it. If you can begin the medication when you know that one is on its way, the blister will not be as painful. If you have a blister, whether popped or not, donot have any relationn with another because they are highly contagious, Always wash your hands before and after you go to the restroom and might come in touching other parts of your body. It would be a good idea to buy a new tooth brush after it is healed and keep your older toothbrush away from others that may keep their bushes near yours. These blisters are painful as you already know. If it hurts and possibly have others, particularly if you pop them, they will have the definitely will have the possibility to spread. A visit to the doctor would be a good idea.
Cold sores or blister generally attack you when you are stressed or going through a difficult time. Be careful. I am sorry about the errors in spelling. Remember , that Zovirax can only be gotten with a prescription, I have used the otc Abreva that helps but the Zovirax is much better.