<s>[INST] I have a large lump on my left leg, It starts just below my knee on the outside of leg, down to almost my ankle. It s sft to touch, not really painful, when you can see both legs together, front on in a mirror it looks huge. It s been there a while.Any idea what it can be, or what to do? [/INST] Hi, dairy have gone through your question. I can understand your concern. You may have some soft tissue tumor like lipoma or neurofibroma or something like that.  You should go for ultrasound localnpart and fine needle aspiration cytology.  It will give you exact diagnosis. Then you should take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health. </s>