I have a hug hard lump on the outer side of my gums on the bottom left side.. i don't kno wat it is. it i do have a cavity right where it is at ..

See your dentist: See your dentist for a definitive diagnosis. The "hard" area can be an exostosis, which is a hard bone, or you may have an abscess. It is difficult to discern without the help of your dentist. A radiograph and clinical examination may help solve your problem.

See a dentist: The "hard lump " is also called fistula is a sign that there is a dental or gum infection and your body is draining it out. See your dentist for evaluation, x-rays and treatment options..

Please: Please see your Dentist ASAP. Although there could be many causes, statistically highest probability is infection. If so, it will not self-cure, only spread to other organ systems. Do not wait, see a Dentist now.