Hi, my little man is 2yrs 7mths, something was bothering him right in the corner of his mouth, I looked and noticed a tiny red mark there and something like a tiny blister. I am so worried it's a coldsore. I'm pretty sure I've had something like it before which was sore but not a coldsore I don't think, thing is I had a coldsore a few weeks ago, I was so careful not to share anything with them, I didn't give them a kiss all week and at night I covered it with plaster incase they touched it, if they went anywhere near it it was straight to the bathroom to wash hands and I even carried alcohol wash with me. I know babies can get very ill with the virus but what about toddlers, he's had a cough for a week but other than that he's fine. Anyone else had a child with a coldsore at this age