I find myself strongly doubting your claim that you're a doctor, Biff, with the language above where you said "to make an accurate diagnosis." Your haphazard grammar and punctuation, too, betray your claim of having been a strong enough student to make it into med school.

If you're claiming you can make an accurate diagnosis of a sore limb online, you're either a fake or the most foolish physician who ever placed hands on a keyboard. Do the real physicians, like my husband, who's standing here laughing over my shoulder, a big favor and don't claim to be what you're not. If you'd like his license number, you're welcome to it. Somehow I'm betting you don't have a state medical license number to provide to anyone. I'm only a first-year med student myself, but frankly, you do my husband's profession--and my future one--a great disservice.

Mr. Devious, I expect you may have simply had an injury or a cramp that's left you with soreness. But if it continues to worry you, go check in with a physician and have him examine the leg, then prescribe a course of treatment. You're so young that it's very unlikely you've developed a blood clot. That tends to occur much more often in older individuals, people like diabetics or heart patients who have very poor circulation, post-operative patients, and very sedentary folks with lots of other health problems.