Small white bump on bottom lip. no pain. it has been present for 2 weeks. tested negative for herpes 7 months after last sexual contact. ?

See your dentist : If the bump on your lip isn't tender, an infection is unlikely. See your dentist or PCP for an exam which is necessary in order to diagnose it.

Not herpes: Herpes doesn't behave at all liks this. Sounds like a small cyst, pimple, etc. Herpes lesions never look the same for as long as 2 weeks. Within a few days it would change from red bump to blister to pimple to open sore to scab, and by now would probably be healed entirely. See a doctor if you remain concerned, but in the meantime you needn't be worried about herpes.