While I was almost running. I knocked my foot on a pavement and fell, my face facing the ground, but luckily I managed to protect my self with my hands. I thus fell on my palms but due to the slippery road I skidded and since I was wearing shorts I scratched my left knee. It's almost three days now and the bruise has clotted well but I feel pain when I walk and stretch my leg. May be the blood clotting stretches with any movement. Is there something I can do at home to take care or please advice?