I have a bump that is very painful when touched or is not touched on my inner gums behind the front bottom teeth it's red and kinda hard squishy.

Infection: This most likely is a abcess or infection. It is important that you get this treated properly. See a dentist asap. This is something that you should not ignore or try to treat yourself. Call a dentist today.

Possible infection: Could be from a non-vital nerve or a periodontal pocket. You need a local dentist to examine it and evaluate it and recommend treatment. Please call for an appointment.