Hi. Are you using any cosmetics ? Using cosmetics on a long run causes lip hyperpigmentation. Use a good fragrance-free lip moisturizer and lip balm. Some chemical peels or q-switch Nd:Yag laser will work good. Would you have any query, please feel free to contact. Regards, Dr. Anshul Jain
Next Steps
Do visit a qualified Dermatologist near you.
Health Tips
Avoid cosmetics