Originally Posted by azz0r

It's definetely not from playing, as the female had the same thing in a different place, plus they don't play that violently.

I think its definetely round worm. I will treat them all again. See how Sams skin is after a week, take him to the vets if it hasn't healed.

I remember how horrified I was when I first saw it on our female, but within a day it was dry and fading and within a fortnight the fur was almost fully back.