This morning I found a lump on my right hamstring. It doesn't hurt, difficult to tell if it's on the hamstring or over it. At the proper angle with a mirror I can see it protruding. Probably about the size of a nickel. It's been a couple of years since being on here and as you can see this discovery has sent my anxiety into overdrive. I jumped rope a couple of times this week and last and did the stair machine at the gym, idk if that could have cause a muscle fiber tear or bruise? My fiance looked at it and said she could see it bruising. I've just never felt a bruise with such a hard, prominent lump before. Has anyone else experienced this?