Hi I scraped the outside of my knee in June and it acted like it was healing normally at first. It scabbed over but then the scab fell off and there has been a mark that kind of looks like a scab since but it doesn't go away! Same thing happened on the left side of my stomach around my rib cage a few weeks ago and it's a reddish mark that won heal! I am wondering why they won't heal, what it could be and if I should go to a doctor about it? Thanks!