<s>[INST] I have a three year old boy with a lump about 2inches long and about one in wide on his shin bone by his ankle. It is hard and unmoveable. It is not painful. It has been there for about a month and does seem to be getting larger. When first noticed it looked like it had a bluish tint to the skin, but that is not as noticible now. What could it be? [/INST] Hello! Welcome to Chat Doctor. This can be a bony tumor i.e. benign or malignant. Rapid increase in size & absence of pain indicate it to be malignant. In my clinic, I do an X-ray to know the nature of swelling. Also, serum alkaline phosphatase, hologram is done.Accordingly, wedge biopsy for homeopath or complete excision with bone grafting is done. Hope this information is useful to you. Wish you healthy life ahead. Thanks. Regards. </s>