I have a hard bump on my gum that looks like a small blister or pimple, help?

Bump on Gums. A bump on gums could be many different things. A large cavity in a tooth can infect the tooth and spread out into the surrounding gum tissue. This infection will worsen if not treated by a dentist soon, causing possible severe pain and tooth loss. It conversly could be a simple soft tissue pathosis that may go away on its own. Either way it is best to have a dds eval. Asap. Dont wait for pain.