Rash Help!

Hi! FTM here, so please refrain from judgement. My baby boy is 4 months old and has had this rash across his forehead for the last 2 weeks. I assumed it was regular baby acne, but it appears to either itch or cause him some discomfort as he is constantly trying to rub either side of his forehead even in his sleep. I have been putting Eucerin on it after wiping it with a cool rag twice a day to no avail. He doesn’t have a fever or anything, so I’m waiting till his appointment on Friday to bring it up with his doctor. My question is, is there anything I can put on it to give him some relief? He’s always rubbing at it and he didn’t have this issue with his baby acne before.