Peeling Lips

Hi - there is a forum here for Peeling Lips - my son has this - his lips have peeled constantly for 2 years - started after he was taking minocycline. The derm did find candida on his lips which we treated with a topical prescription but didn't cure. He has done many other steroids - trimcinclone, clobetasol. He has also done an anti-inflammatory diet prescribed by a naturopath and and candida diet both for over 3 months. And we have done a lot of natural type things. Can you recommend something - and sounds like it may be internal since topical treatments don't work - but he doesn't have any other symptons - could it be coming from candida in his system?

Thanks!