<s>[INST] Hi I am having severe pain in my upper left buttock where the thigh meets. It radiates through my whole left leg. I also have a hard lump there in my buttock. Its extremely hard to go from siting to standing or bending over. Do you have any ideas what this could be. I ve had this for four months now. Ice is the only thing that seems to help. [/INST] Hi,Thank you for posting your query.It is possible that the lump is pressing on the sciatic nerve and causing your symptoms (pain in thigh, radiating to the left leg). This lump could be a benign tumor.An ultrasound examination and evaluation by a doctor would help identify the exact cause.Please get back if you require any additional information.Best wishes,Dr Sudhir Kumar MD (Internal Medicine), DM (Neurology)Senior Consultant NeurologistApollo Hospitals, Hyderabad,My personal URL on this website:   My email: drsudhirkumar@yahoo.comMy blog: </s>