Ah, they are just blood blisters on his feet. If he just pokes a hole in 'em and drain 'em they'd be fine. It's not bad. My feet have looked way worse than that before (danceing on toe shoes... owwy) and I've lost quite a few toenails. I had one blister durring cross country my college freshmen year that they had to take me down to the football training room for (that's where their head trainer is located) to have him drain it... all the football guys thought it was the grossest thing in the world haha! I was like, ah, nice, just pop it and get it over with please! Anyway... if you know how to treat the blisters it's not that bad after you pop 'em it's like they weren't even there, just don't rip all the skin off of 'em! Oww!