Angular cheilitis and nutritional deficiency

Cracks at one or both mouth corners cannot identify a deficiency on their own. The pattern, recurrence, diet, medicines and other symptoms help a clinician decide whether examination or blood tests are useful.

Low iron and shortages of certain B vitamins can affect the tissues lining the mouth and may occur alongside angular cheilitis. Clues elsewhere can include unusual tiredness, a sore or smooth tongue, mouth ulcers, pallor, or changes in eating patterns, although these features have several explanations.

Moisture collecting in a skin fold can soften the corners and allow yeast or bacteria to contribute. Lip licking, drooling, dry or sensitive skin, and dentures that alter the mouth crease may therefore matter even when nutrition is adequate.

Keep the corners gently clean, pat them dry after eating or drinking, and apply a plain fragrance-free barrier such as petroleum jelly. Avoid licking, picking, strongly flavoured lip products and unprescribed steroid creams, which can irritate the area or obscure an infection.

Do not start high-dose iron or vitamin supplements solely because of cracked corners. A clinician can review diet, digestive symptoms, menstrual blood loss, medicines and recurrence, then select testing or treatment. Antifungal or antibacterial treatment may be needed when infection is suspected.

Arrange an appointment if the cracks persist despite gentle barrier care, keep returning, spread beyond the corners, or occur with fatigue, tongue soreness, swallowing difficulty, weight change or bowel symptoms. Seek prompt care for rapidly increasing swelling, spreading redness, pus, fever, severe pain, or difficulty breathing or swallowing.

You might ask whether the appearance suggests irritation or infection, whether your diet or health history supports blood testing, and which barrier or prescribed medicine is suitable for the lip corners. If you wear dentures, ask whether their fit or cleaning routine could be trapping saliva.