Have you made the appointment yet? If not, do so now, not later.
Your doc will examine your testicle & more than likely send you for an ultrasound, if it is clear, you are good to go. If not, there will be blood tests & a CT scan scheduled as well as an I/O surgery. The pathology results along with the other tests will determine what happens next, but for now, get in to see the doc, chances are good it is not TC, there are lots of things that can cause bumps, but only your doc can make that call.
Jan, 1975: Right I/O, followed by RPLND
Dec, 2009: Left I/O, followed by 3xBEP