Angular cheilitis and the bottom lip

Typical changes include a tender crack at one or both corners, redness or altered colour, scaling, and soreness when opening the mouth. Dryness across the centre of the lower lip may instead point to broader lip inflammation, irritation, or another cause that deserves separate assessment.

Saliva can collect where the upper and lower lips meet. Repeated wetting softens the skin, while drying, licking, and mouth movement weaken its surface and encourage splitting. Yeast or bacteria may then contribute to inflammation in the damaged fold.

A dental appliance, reduced support at the mouth corners, drooling during sleep, or a habit of licking the lower lip can keep the area damp. Eczema, contact irritation, or nutritional and health issues may also need consideration when the problem is persistent or widespread.

Gently rinse away food or toothpaste, pat the corners dry, and avoid pulling off flakes. A bland, fragrance-free barrier ointment can reduce saliva contact and friction. Try not to lick, bite, or stretch the cracked area, and pause any new lip product that stings.

Treatment depends on what is driving the inflammation. A clinician may distinguish simple irritation from fungal or bacterial involvement and select a suitable medicine. Do not apply a steroid cream around the mouth without guidance because it may mask or worsen an untreated infection.

Book an assessment if the split keeps returning, spreads beyond the corner, does not begin to settle with gentle protection, or makes eating uncomfortable. Evaluation is also sensible when there are mouth sores, a sore tongue, marked fatigue, or concerns about a denture or bite.

Seek prompt care for rapidly increasing swelling, spreading redness, pus, fever, severe pain, or difficulty swallowing or breathing. A blistering or crusted eruption across the lip may have a different cause and should not be assumed to be angular cheilitis.

Ask whether the centre of the bottom lip is part of the same inflammation, whether a swab or blood test would change management, and which barrier is least likely to irritate you. Mention denture use, dry mouth, nighttime drooling, new toothpaste or cosmetics, and medicines applied so far.