Causes of Cheilitis on the Lips

The lips lose moisture easily, so licking them can briefly soothe dryness but repeatedly wetting and drying the surface may worsen irritation. Toothpaste, mouthwash, lip products, fragrances, flavourings, and dental materials can trigger contact dermatitis in some people. Weather exposure, saliva pooling at the corners, and biting or picking can produce cracking. Cheilitis may affect the lip surface, the corners, or both. Persistent scaling can also occur with eczema, nutritional problems, or infection, so appearance alone cannot identify the cause.

Stop newly introduced lip products and avoid fragranced or flavoured products while the skin settles. Try not to lick, bite, or peel the lips. A bland protective ointment can reduce water loss; Emollient Therapy may be discussed for ongoing dryness. If a clinician identifies inflammatory dermatitis, they may consider Topical Corticosteroids with instructions about where and how long to use them. Avoid applying medicated products inside the mouth unless specifically advised.

Arrange an assessment if cracking, crusting, bleeding, pain, or swelling persists despite removing likely irritants, or if the corners repeatedly split. Seek urgent help for rapidly increasing swelling, trouble breathing or swallowing, or widespread blistering after a product or medicine. A sore that does not heal, especially on a sun-exposed lip, needs timely examination.

Ask whether the pattern suggests irritation, allergy, infection, or another skin condition; which products to stop; and whether patch testing or a prescription is appropriate. Mention toothpaste, cosmetics, dental work, medicines, lip-licking, and any mouth symptoms.