Bit of a long shot, Looking for little round blue pills

One of my 6 year old doggies has a skin condition, which seems to have no cure. 

Over the years we've been to several vets each one prescribing various medicines non of which actually cured the condition. 

I have been following any "doggie skin condition" threads on here and have tried each and every suggested remedies posted.

Nothing really worked except some little blue pills that I think I got from a local vet. When giving these little pills I noticed a marked improvement in my doggies skin condition, so gradually over time reduced the dosage from one a day down to one a week, and the condition remained under control. 

Happy days - except the vet stopped stocking those little round blue pills and gave me some white oblong shaped pills which he said were the same. 

But of course they were not the same and poor little doggie's condition started to fair up again.

Anyway as I said, a long shot, but just wonder if any one has come across little round blue pills in their pets skin treatment and could tell me the name so I could search on Lazada for them.

Thanks.