That does look like wheel rub so he will need a different wheel and his skin could get sore. To help with the fur generally, can you get linseeds (flax seeds)? A pinch of those daily starts to work wonders with fur condition and they like them and nibble them up. I put them separately to the rest of the food on a different dish and our hammy licks them up every day.
If you can find an 8 to 11 inch wheel it would be good - ideally with a solid running track. If it's hard to find wheels, could you make a bucket wheel? Here's a thread about making one.
MY DIY Bucket Wheel
There's a simple one here
https://www.youtube.com/watch?v=ZeuJ66PWsks
This one needs a few diy parts and possibly a drill (or a screwdriver), but uses a fidget spinner to make ballbearings and a silent wheel!
https://www.youtube.com/watch?v=5-gBqOislbU
This site seems to sell wodent wheels also - cost conversion doesn't seem too bad?