Probably overreacting but I’m kinda panicked

We live with my boyfriends aunt and today while eating lunch I noticed she had a cold sore it looked like it’s been there awhile but for some reason I can’t remember seeing it there before.🙈

But anyway she was holding my son earlier while I had his brother in the bath and he’s a baby and sometimes he touches people’s faces and I’m freaking out over the fact that he could have touched it and stuck his fingers in his mouth..what are the chances of him getting it?

My anxiety is through the roof 😰