.50 yr old male. Good physical condition. While participating in martial arts had a swelling (4" x 3") on middle of shin due to kick blocking. No real bruising just swelling. That went away after a week or so but left a small hard bump just left of center of the shin. It's not tender or painful, the size of a quarter and raised approx 1/8" at the center. no discoloration. It has been about 6 weeks since the initial injury. The lump is not growing but not shrinking as either. Am thinking cyst maybe.