### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
i have a bump on my left thigh, feels hard under the skin like I hit it... have a little bit of bruising. Im 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.

### output:

HI, Dear, Thanks for the query from you for your painless hard lump under the skin in Lt. thigh.1-I feel concerned that you are serious to know where from this hard Lt thigh lump- occurred after the hot yoga or may have occurred when at the bay 3 MTV back.?2-In my opinion this hard lump had a bruising meaning thereby it occurred from a blunt trauma during hot yoga or trauma when at bay 3 myths back-which is the remote possibility as its bruised, and most probably appears to be due to trauma during hot yoga as it appeared after few days after you did hot yoga.3-In presence of the normal hormonal levels for the muscle injury, it appears to be hit 3 myths back -leading to hard -organizing hematoma, which got bruised after few days of hot yoga.4-USG study / Muscle biopsy studied, would fix its origin and cause of development. I would advise having surgeons opinion from your ER.3-I would advise FNAC to fix the reason and hence would refer the case to ER Surgeon. 5-Hope this would solve your worry of the hard lump on the thigh.6-Wellcome to Chat Doctor for any more query.