We have tried- LOTS of combo's... Locks had really bad eczema for a while, which went, now bad dribble rash. We use Lucas Paw paw as a barrier, but have started to put on some
Trilogy Rosehip Oil (lighter than A'Kin) prior as it goes deep into the skin and helps rebuild the structure of the skin. It helps heaps. Try a patch first though, to make sure his skin is ok with it.
And avoid direct sunlight for a while after (not that babies should ever be in direct sunlight), but its a sensitive oil, so works best 'unzapped' by the sun.
Another thing- Amber teething necklace worked wonders for the angry redness too.... I couldnt belive it.
Here is some more info on Rosehip oil:
Link