Well, ich is a tiny white parasite, so you can rule that out.

What it looks like to me is blisters. They might be formed by him rubbing against something rough, like rough gravel or decor, as he swam close to it. Bacteria could have gotten in tiny wounds and caused the blisters. Check the water parameters to make sure everything is good. The best cure would be pristine water and antibiotics, but I'd personally use a quarentine tank of sorts so as not to mess with the cycle. It would also help if he weren't rubbing his fins on the gravel as he healed.