<s>[INST] Hello, I am a healthy, active 31 yr old. I have a small hard lump, about the size of a large pea, on my lower left leg in the center between the ankle bones.  I just notices it a few days ago after stretching and massaging my foot after running.  It doesnt hurt and is not mis-colored.  What could this be? [/INST] Hi, dairy have gone through your question. I can understand your concern. You may have some benign cyst like ganglion cyst. Or you may have some soft tissue tumor like lipoma, neurofibroma or dermatofibroma.  You should go for biopsy. 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>