I HIT MY KNEE ON A RADIATOR HARD IN A FALL,PARA MEDICS ATTENDED,AND THE KNEE WAS ALL INTACT,THERE WAS A GREAT SWELLING PARTICULARLY TO THE INSIDE OF MY KNEE,THIS IS SLOWLY GOING DOWN,AND EVERY MOVEMENT IS TIGHT AND HURTS A WEE BIT.Now I note a blister has appeared where the most swelling was on the inside of my leg ,alongside the knee,is there any treatment please.