Keep the corners of the mouth clean and dry
Apply petroleum jelly or a thick barrier ointment several times a day
Avoid licking, biting, or picking at the cracks
Use a lip balm or ointment before sleep
Switch to a gentle, fragrance-free toothpaste
Avoid spicy, acidic, salty, or very hot foods until healed
Stay hydrated
Treat any fungal or bacterial infection if present
Use an over-the-counter antifungal cream if yeast is suspected
Use a mild hydrocortisone cream only if advised by a clinician
Correct dry lips with regular moisturizing
Check for and address dentures, braces, or saliva pooling
Replace missing vitamins or iron if a deficiency is confirmed
See a clinician if it lasts more than 1 to 2 weeks
Seek medical care sooner if it is severe, recurrent, swollen, or painful