A few weeks ago I got a red spot on my shin just under my knee that's about and inch high and three inches wide. It's smooth and is plain red, it looks almost like I could have walked into the edge of a table. Within this past week I have noticed light purple vertical lines near the spot, they almost look like stretch marks but aren't raised or indented or anything. There are about 7 of these lines next to each other, and the outer edge of the spot to the last line goes from the outer side of my right leg to the inner back part of the leg just below my knee. Does anyone happen to know what this could be? The area isn't raised or itchy it's just a discolouration on my skin.