I'm freaking out. My one year old has a pimple a little bit on his lip and above it. He has sensitive skin and gets acne a lot and it kind of looks like it, but can acne get on the lip? Or is it a cold sore? I'm very worried it's a cold sore since i've read and heard that cold sores can be very serious in babies. My little sister gets cold sores and i tell her not to kiss him or go near his mouth but she is special needs and doesn't understand I think sometimes and she may have given him one. I sure hope not! What is the difference between a pimple and a cold sore on a one-year-old?