Hi. I fell down on the road today morning and scraped my knees and palms. I washed with water and lightly wiped with cotton dipped in savlon solution. However it still has a burning sensation and the skin feels like its tightening although it's blood red in colour (no bleeding). I suppose it's just the wound drying?  Do I need to put a band-aid on it or can I leave it open to air? Which will help it heal faster? I usually don't get hurt like this so I'm not sure! Thanks in advance!