Looks like ringworm - and ringworm sucks.
I've had a nightmare struggle with one of my hairless boys jake who picks it up (although it looks like only a redness of the skin - but glows under UV so ringworm is present), gives it to me, and even though I try my damndest not to return the favour, it's turned into a vicious circle. (I blame my mother who catches it occasionally from my laundry and never puts enough effort into getting rid of it) We have a medicated shampoo for him and I use Lamisil cream on the effected area and that usually clears it up. But it's a pain to get rid of! We have months free - and then BAM it's back!
Luckily, none of my others seem effected. Only Jake
And I agree with the wound - it looks like a fighting scrape vs any skin condition I've seen.