D.W.
If you are concerned - GET ANOTHER OPINION!!! I found a lump onmy collarbone last year - 7 weeks postpartum. The first doctor wasn't "excited" about it, so I went to another doctor who ordered a biopsy just to rule out anything bad. 4 weeks later, the day before my son's 2nd birthday, I was diagnosed with cancer (Hodgkins). No one really thought it was going to be a malignancy. Be thorough, but don't get crazy. Stay off the internet, it will consume you. Just be thorough. Doctors don't want to be wrong, and if it is something serious, they want someone else to catch it. I still go to the first doctor who missed it. I knew my body - it wasn't his fault.