We used calendula when he first got it a couple of years ago didn't really help him much. Using bepanthen then has made him able to go to school 2days a week. He just got good insurance so we may do allergy testing if it's covered and he is also thinking about doing a water fast.
I have always thought it's somehow related to hormones since so many guys in the young age range seem to have it. Seems to much if a coincidence it must be a factor.