I have a small bump by my elbow it has been there for a few days and now it is getting a little bigger then a pea. It hurts when touched then it throbs for a bit after. I can't rest my arm due to the bump. I have no infection. I am on hydromorphone 18mg 2x a day. Dilaudid 4mg 3x a day for break through pain when needed. Dimenhydrinate 50mg taken with the Dilaudid and hydromorphone. Pantoprazole 40mg 2 pills once a day. Retrace 0.5mg 2 tablets once a day. When the bump is touched it moves a little, but now does not move. When I first noticed the bump if I pressed it it would disappear and now that it is growing it does not dissappear. What is it? And should I be worried? And what can I do about it?