Undecided Question

Lump is hard and painful inside front bottom of right side of lower lip.?

I noticed this lump only about a week ago……it hurts when I put my finger in my mouth and press hard down on it. It doesn't hurt without touching it. It is under the skin. It feels like it is thick and wide along the bottom of the inside of the front part of the mouth (an inch long), then the tip of the lump narrows up to the gum.
Should I see my primary care physician or a dentist? I am a hypochondriac and think I have oral cancer. Help?
I don't have gum disease and my dental care is up to date. I was at the dentist a short while ago, and there is no dental work left to be done. My mouth is immaculate. I was tested a few years ago and had no oral cancer.
Has anyone else had anything like this appear out of the blue???????