Hi what is he eating (diet) ??? you need to build his immune system up, after taken meds like Clavamox & Steroids they lower the immune, they’re no good, Change diet, feed fresh foods Raw if you can afforded, foods high in omega 3 fatty acids & add omega 3,6 & 9 omega oil double the recommended dose for the first 2 months Bath in Malaseb medicated shampoo weekly or when the scratching is bad, I use baby wipes when he’s been outside to wipe off any allergens & pollens… I use Huggies baby wipes Cucumber & Aloe..Creams, I use Hydrocortisone 1% cream every night at bed time when needed..
if all this doesn’t work then see a Dermatoogist.. a good Face Book group to join is called “Dog Issues,allergies andother Imformation support Group” You’ll get heaps of help
https://www.facebook.com/groups/240043826044760
