You should check if you friend have oral herpes aand if he does them go to the octor
If you want to stop it without using any medication, the best way to do it is by drinking warm herbal liquid like the mixture of warm tea and a little bit of honey or the mixture of warm water with a little bit of salt
If you want to stop it using medication, it's probably best to use the one that contained pepto-bismol or simethicone
Option num 3...............................................