Hello, I have this weird burn mark on my upper knee that first started out very small and has now spread to about an inch and I am concerned because I did not feel anything at first. Usually I know when I burn myself. I recently got an itchy sensation and it led to another small burn mark, I m concerned this mark might spread as well. By the way, I have no allergies to anything, only to almonds and avocados, which I have not eaten.