Your water intake may be low, you are female of 33 yr so take 3 ltr per day it keep you hydrated and apply lip balm or moisturizer or Vaseline every day it keep moisture lock and prevent from dryness .
Next Steps
For discoloration you have consult with me and do visit my clinic so I give lip pigmentation treatment it help you to correct your dark lip color to pinkish lip tone in 3 sitting means in 2 month.
Health Tips
apply sunscreen also on your lip ,if you have any query msg me on instagram Jovi_healthcentre