Stop smoking and avoid secondhand smoke
Stay hydrated throughout the day
Use SPF lip balm daily
Exfoliate lips gently 1 to 2 times per week
Avoid licking, biting, or picking at your lips
Remove lip products before sleeping
Use fragrance-free, non-irritating lip care products
Switch to a gentle toothpaste if irritation occurs
Limit excess caffeine and very hot beverages
Eat a balanced diet rich in iron, folate, and vitamin B12
Treat allergies or eczema that affect the lips
Avoid prolonged sun exposure
Use a humidifier in dry environments
Apply petroleum jelly or a nourishing lip balm regularly
Consult a dermatologist if darkening is sudden, severe, or persistent