Hello, back in the end of 2018 I had herpes labialis where I faced with mouth infection and sores on lips after which doctors provided a antiviral drug something called as zovirax 200 mg 5 times a day, with vitamin capsule becosules, though it certainly went out but in the year 2019 and even in this year very less frequently the blisters on lips still occurs, how to get rid of that completely? And even from the last few months or so I am having mouth ulcers frequently like 3 to 4 times in a month at the max. What is the reason behind that? How to eliminate or curb the rate of ulcers? Please provide suggestions and the reason behind this.