My little boy (10 months old) has had excessive dribble for a few days, so thought teething. But now he has these spots at either side of his mouth and under his bottom lip! They keep going yellow/ look slightly filled. Im so so scared they are cold sores!? Tried ringing docs and can’t see him today so now i am panicking. He does have a fever so been giving him calpol too. Pics attached!