<s>[INST] Hi, may I answer your health queries right now ?  Please type your query here... I have a golf ball-size bruise on my inner & and upper left thigh.  Beneath it I can feel a small hard lump, slightly tender to rub over it.  I have no idea how I got the bruise.  I exercise regularly but have not hit into anything.  Should I be concerned and if I need to see a doctor, should I go to my regurlar physician?  Thank you. [/INST] Welcome to Chat Doctor. 1. The history and location suggest most possible cause could be lymph nodal enlargement, followed by venous pathology.2. Ths lymph nodal enlargement is seen in any infections / inflammation, localized or systemic conditions and presence of malignancies.3. I would recommend getting an ultrasound examination done which will differentiate the lymph nodal mass from any vascular, cystic structures.4. The ultrasound will help to identify the nature of lump, and where it is existing from. An FNAC will give definitive histological diagnosis.5. You can see your regular physician - the physician would refer according to the findings. Good luck. Hope I have answered your query.Anything to ask do not hesitate. Thank you. </s>