too much jumping?

A few mornings ago, I pulled off Gordy's pjs to find red sores on each of his big toes!  The sores were super raw and were in the same place on each toe.  We've been putting creme on his toes and them covering them with socks until they heal, but we can't figure out what happened!

Todd thinks it's because the footed pjs I've been putting on him are a bit tight and they rubbed his toes raw.  My best guess is that he blistered his toes when he was jumping in his jumper (he jumped for like 10 minutes straight on the hard flooring) and then the pjs rubbed off the blisters.  Regardless, we've added the pjs to the box of clothes that Gordy has grown out of and will be covering his feet with socks for a while.  Poor little toes!