Cold sore and 3 month old.

Brooke

So... we are visiting my mom for the new year and after she got done holding my 3 month old I realized she has a cold sore. She told me she didn’t kiss him, but I’m scared she might have and didn’t realize it or something. Should I be concerned?! She never kisses him on his lips or near his mouth but I am freaking out. What do I do?!?