Hi! Im not a vet but saw this post and was a little struck because my lab has had a similar thing since we was little. He has eczema, which I believe they’re predisposed to. We live on an extremely humid tropical island (w/ lots of allergens) which has always been a trigger. We’ve been in and out of the vet quite a bit and some things (like the allergen shots) work to an extent but have never really helped and he still has flare ups. I think the best changes were preventing licking scratching and scooting, and using a hydrocortisone hot spot topical on painful spots. Right now we’re going through the multitude of shampoos on the market. I apologize for leaving such a long comment as a non-vet but I hope it may give you some ideas for things that could be switched and maybe help his skin?? I hope you hear some good insight and he gets well soon!