Ds 13 has had this twice in a month now. We went to see the pharmacist first time around. She didn’t say what it could be but gave us carmex to try. It disappeared within a week. It’s back again but even more red and swollen. He finds it hard to open his mouth as his lips are cracking and very painful. He still uses the carmex but not knowing what it is is bothering me. Not sure if it’s infectious or what it’s caused by. Anyone else had this ? Don’t really want to bother the gp for this. Not yet anyway.