Hi, this site really helpful. About a year ago I noticed a hard mass on my thigh (left leg). It's hard like and doesn't move around when I touch it. I did have a pain in that part of my thigh that comes and goes (sometimes pain in all leg or tight), so lately I had my ultrasound so the doctor told me that he need to do a biopsy so till now I didn't do it because I read it’s very dangerous is that true? or I must do it? and what do you think may I have something serious ?