A few days ago I fell on the road and scrapped my knee. Its been irritated ever since then. There's a SMALL amount of heat around the area and it's also red around the area. There is a yellow film that covers the main injury and it wont come off. I cleaned it with peroxide to make sure there was no dirt and then i put neosporin on it with a large bandage. I don't know how to get the picture on here so I can't show you. Am i taking care of it correctly? Do any of the signs point to infection?