question: My eight year old son has a large, firm knot that is growing on top of his right bicep. It is not red, it is not painful, there s no fever or trauma to his arm, it s been checked out and is determined that it s not a sist or just fatty tissue. They say it may be osteomyelitis, but he does not have any of the symptoms. Does anyone know anything else that could be going on? What are your thoughts??