The left side of my face(eye, eyebrow, cheek, nose, lip and chin) have been itching for 2 weeks! itching is not satisfying, but painful! what's it?

See below: The trigeminal nerve's 3 branches provide sensation to the areas you describe as well as motor control of the jaw muscles. If you had a blistery rash, it might be shingles (which would have appeared sooner than 2 weeks). Trigeminal neuralgia usually affects older people but can be seen in younger. See a neurologist for definitive diagnosis & treatment (the sooner the better in order to get relief).

Trigeminal Neuralgia: ...Or atypical facial pain. See a pain specialist. You may benefit from anti-seizure medication or tricyclic antidepressant.