Is it normal to have mouth ulcer outbreak after kissing guy with cold sores?

Yes. Cold sores are transmitted from person to person by kissing. Mouth ulcers are caused by herpes simplex virus 1 which also causes cold sores.

Related Questions

I cut my lingual frenulum from kissing. For the next few days, I suffered from a mouth ulcer, a cold sore, infected tonsils, headaches, and my gums seemed to lower. Could it be hiv?

No, relax. You may be overreacting. More likely, you have strep throat or pharyngitis. The cold sore is probably stress-related because you have pharyngitis are perseverating over this situation. Hiv transmission rate is very small orally, unless you were both bleeding. That being said, you should consider the possibility that there are much less painful ways of kissing people. Read more...
Kissing. Your symptoms are indicative of a viral illness transmitted to you through vigorous kissing. Read more...