Tingling and burning in my lip for about two weeks. no sores or lesions.i have no been sexually active for 7 months. what could this be?

Herpes labialis: A cold sore (herpes labialis) doesn't have to always show as a sore. It can manifest as only burning and tingling in the lip. Please see your health care provider if it worsens or persists.

Burning lip: Possibilities include: minor herpes simplex virus1 that has not erupted. Herpes lives in nerve tissue and produce symptoms like you describe; trigeminal neuralgia, but atypical for that syndrome; minor manifestation of an atypical Bell's palsy -- that this has been present for 2 weeks is reassuring - not progressing

Don' gimme no lip!: Lots of people get tinglings and burnings that eventually go away.If this were the 13th Century I'd tell you it's a little devil and to pray.Well, prayer never hurts, and neither does patience.At your age it could be nothing or the beginning of a rash or skin lesion. Wait another two weeks and see.Make sure you don't have little habits, like lip licking or scratching or if it's a certain food