My baby is three weeks old and have Woken up to find he has a spot on his chin (photo attached). The reason I’m worried is because almost a week ago a family member held him for an hour, and only afterwards told me they had a cold sore. I was extremely upset afterwards, as had I known I would have asked them to wait until it had gone to hold him. They didn’t kiss him, and said they were careful with hand washing etc, but of course have been a little worried since. Does the photo just look like baby acne?