Dodger's mysterious bumps

I took Dodger to the vet Monday. He has developed some awful looking bumps on his face, and Aaron and I were becoming a little worried. When the vet saw Dodger, he looked at me and said, "Well, you peaked my interest." Unfortunately, after lots of questions the vet was still unsure of what Dodger had come in contact with to develop such a rare breakout. He is currently on an antibiotic and a steriod. He goes back to the vet in about 2 weeks to see if his infection has cleared up. I'll let you guys know what happens with his next visit.

Dodger's bumps are starting to clear up, but they haven't completely healed. As you can tell from the picture, he has no hair where his infections are. We are hoping is hair returns. We go in a week to the vet. Hopefully, we'll get good news on how he is healing.