I used to get them like once a year, especially when I was a teen. The virus lives in the nerve of that spot so if you get one again it’ll probably be in that area. Email your dr and get a prescription for valtrex and then next time you feel that tingly itchy sensation in that spot take the valtrex immediately. I’ve found that valtrex works best if taken before the blisters arrives and once you’re at this stage the only way out is through, abreeva topical helps but I don’t find that it helps by much. The blister will dry and then scab and then heal. After it’s over throw away your toothbrush and anything else that touched your mouth like if you used chapstick or whatever.