i have a bump on my left thigh, feels hard under the skin like I hit it... have a little bit of bruising. I'm 30, 5.6 ft, healthy, noticed it a few days after I did hot yoga, not sure what exactly its from. recently had a bay (3 months). had a blood test done - the hormone that should be in the blood if the muscle is torn wasnt found, had an ultrasound of the thigh tissue - normal.