When people kiss your baby....

I have been on vacation for one week with my husband and 5 mo old son. I asked people that if they must kiss my baby, please on the forehead. Some people did not listen!! Now I woke up this morning with what I think is a cold sore and I always give my baby kisses 😔😔 I'm irate!! Now I'm stressing and looking for signs to appear on my son 😠😠