My bottom gums are bright red and swollen. im in pain and when i touch my chin the pain there gets worse. what to do.

See a dentist: Can't tell you much more since we know nothing about you, other than the fact that you are female. Determine if the problem is dentally related and treat it.

Most probably: Most probably a tooth or gum infection, although there are many other reasons. See your Dentist as quickly as possible for differential diagnosis and correct treatment.