Keep the corners clean and dry
Apply petroleum jelly or a thick fragrance-free ointment often
Use an antifungal cream if yeast is suspected
Use a mild hydrocortisone cream only if advised by a clinician
Avoid licking, biting, or picking the area
Avoid spicy, acidic, salty, and very hot foods
Switch to a gentle, fragrance-free lip balm and toothpaste
Drink enough water
Use a soft toothbrush and brush gently
Check for ill-fitting dentures, braces, or dental issues
Take a B vitamin, iron, or zinc supplement only if deficient
See a clinician if it lasts more than 1 to 2 weeks, keeps coming back, or is severe