You should probably get it checked out by a dentist. It may be an abscess although you're right, antibiotics would probably help to keep it controlled but there are many different types of antibiotics and each one works better for particular types of bacteria in the body.
My guess though, is that its a maxillary tori, which is just excess bone and probably has been there your whole life and you just never noticed it. But I can't confirm it over the internet. Would recommend you get it verified in case its something else.
You probably have an infection. I remember my baby brother bumped his mouth on our corridor. He hit it so hard, his two front tooth swell. Maybe you need to have it checked. Good luck
Thank you Dr Tsang. I will mention it to my Dr. I'm really scared it's cancer.
The bump feels to be about the size of a pea in diameter. It's right next to the strip the goes from front to back and is about the same height as that ridge. It's a little sore if you push on it towards the back part almost near where the softer area is beyond your hard palate. Could this be irritated from the one strong antibiotic biaxin? Cause after I take that pill I can taste it towards the back of my upper mouth. I'm frightened! I am just trying to get better and now this. :( Please help!!!!