How do you lower a lump?

You need to see a dentist or an oral surgeon. The lump could be any number of things including oral cancer. The dentist can assess the lump and perform a biopsy if necessary.

it feel like aknot

I don't know the actual name for it, but it is supposed to be there. I do however know that it is the beginging of your spine.

well...swollen back could be anything...even a blood clot, an std, or some cracks inside of your skin which could be causing this. if it is a short term swelling, then you should just put ice on it,...

Yes, they could be. How could anyone at a site like this eliminate that possibility? You should get to you medical doctor right away.