I have a small pinkish bump under my tongue with a slightly pinkish white tip on it. it doesn't hurt unless i either run it on my teeth?

Simple cyst: It will most likely resolve in a few days. Simple cysts may drain on their own. If it gets painful or more swollen se a doctor.

Most likely: a ranula or mucous cyst , show to you doctor or dentist to make sure what it is and treatment.

Bump: To arrive at a diagnosis, an to then prescribed treatment, if necessary, lesion has to be examined. Call your Dentist for an examination.