I recently went bike-riding with my best friend. After wards, as soon as I took a shower, I noticed faint red marks/spots just below my knees. It looks similar to my red stretch marks behind my knees. And I fear to have more. Could you possibly get red stretch marks just after exercising?! I don't think I lost THAT much weight in order for this thing to occur. Also, the red stretch marks behind my knees appeared after I took gym classes. I don't exercise excessively. Any help or inputs?? I've been using cocoa butter, but it takes awhile to see results. 