Remedy for Dog's Itchy Skin?

I got my two year old German Shepherd when he was four months old. He is now two and during the time between now and when we first got him, his stomach has only been clear of red spots and scabs once.

We were told the first time he had allergies and tried to give him allergy meds, but nothing ever worked. Next we were told he had an infection and he was prescribed some meds and it seemed to help a little. We got this new shampoo and I tried to clean his belly better than usual. Well that helped him so much. It was the first time we saw it white and all the scabs were disappearing. He's afraid to take baths, it is really difficult to give him one and we are a busy couple so we try to give him a bath whenever we can.

My question is, is there anything we can put on his stomach that will not harm him even if he were to lick it but will taste nasty enough for him to leave it alone?

By Hanson Family