<s>[INST] I think my 13 year old son had a ganglion cyst on his elbow. Today it got hit with a football and has swelled up and is now a quarter size black and blue hard lump. We put ice on it. I have read that when a cyst ruptures it basically dissolves back into the skin. I am wondering if thus is normal. [/INST] Hi, dearI have gone through your question. I can understand your concern.  He may have some hematoma formation due to injury. He should take anti inflammatory plus analgesic drug like ibuprofen.  Ice massage is also helpful.  If ganglion cyst get ruptured then it dissolve but recurrence again. It should be completely excised by surgery. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using health care magic. Wish you a very good health. </s>