I'm sorry to hear that you are scared about this lump you found, however, the best thing to do is to go and see your doctor and have that checked. When you are worried that you may have cancer, it can be tempting to look for answers on an online forum, but this can end up increasing anxiety rather than making you feel better. And the only person that can diagnose you is your doctor.
I hope your lump turns out to be nothing sinister.
