<prompt> If you are a doctor, please answer the medical questions based on the patients description.My son has a golf ball sized lump above his inner ankle 9we assume from sports? although he doesnt remember how he did it- it does not hurt but looks odd. any ideas on what this might be? We dont have insurance so Im trying to postpone a dr. visit, but its been a month and its the same size.  <response>: Hello! Thank you for the query. Most likely this is nothing serious. In this location he may have a ganglion cyst, lipoma or sebaceous cyst. All these lumps are benign and do not lead to a cancer. However, can cause pain and inflammation especially sebaceous cyst. That is why, sometimes it is worth to remove such lump. I suggest you to have an ultrasound of this lump and consult general surgeon. Hope this will help. Regards. 