My son broke his Tibia in 2 places, just above the ankle last Sun, skiing, no skin broken though. Leg swollen, lots of pain, hard to find med that ease pain. Ortho. waiting for swelling to go down so he can do surgery & perhaps insert a rod in leg. Today, his cast was oozing yellow fluid, & they went back to ER. It s coming from his skin. Is the yellow fluid a sign of infection?