question: I scraped both of my knee yesterday afternoon walking on the side walk. When I got home I washed both out with soap and water, and let them breathe. When I went to bed I put a non- adherent sterile pad on both knees and when I woke up one of them was healing perfectly fine and the other scrape had a yellow puss coming out of it. It hurts to bend my leg and to put pressure on it. Should I be getting this checked out?