<s>[INST] On the inside on my kid(3y) mouth on lower jaw bone beneath  teeth ,  jaw bone seems to be protruding out like there is a large lump. It does not hurt to press on it and I cannot move it. It also feel very hard and seems to be part of jaw bone. It is similar in the other side but not nearly as large. I m afraid it might be a tumor growing within  bone [/INST] Dear friend. Thanks for sharing your concern. As you have mentioned in your history that, it is painless bony growth, it could be an exocytosis. That is a mass of bone protruding from the jaw. You must visit your dentist, irrespective of growth being painful or not, and get it examined clinically. Also keep a close watch on its progression, if there are any changes report to the dentist. In my view it should be a Tori or exocytosis. Which can be corrected surgically in later stages, but present evaluation is must. Hope it helps. Thanks. Take care. </s>