After Radiation lip

It's been a year since I finished radiation on my brain.  I've had this lump on my lip since then.  I had thrush and all that stuff durring radiation, but this lump hasn't gone away.  My Dentist said that I should have my Oncologist look at it.  I haven't yet, but was wondering if anyone else has this.  It's really the least bothersome of my symptoms since the radiation, but it's been bugging me.  It's like when you have something in your mouth and you can't leave it alone.