Ouch! I sure hope your leg heals quickly! It looks very painful!!!!!!!

Cortisone Cream or Ointment just on the blistered part might help. Not sure I'd put it on the open wound area though. You poor thing. A trip to Urgent Care may not be a bad idea...they could probably give you something stronger than just an over-the-counter cream and it might do the trick.

Good luck!