Help! Ringworm?

Mine has something a bit odd like this. I thought it was a sort of heat rash but vet said bacterial infection. He had 10 days of ABs and has to be washed every 3 days in Malaseb shampoo. It's clearing up really well. I had to clip to get to it all though... Since I've been using the shampoo his has dried up but it's leaving little bald patches where the scab/hair falls off.
 
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