Chapped lips are common in dry weather, but cracks or sores at the corners of the mouth that linger, split open, or keep coming back can point to something more than the weather. This pattern, known as angular cheilitis, is often linked to low levels of B vitamins or iron, nutrients your body needs to keep skin and mucous membranes healthy. Recognizing this connection can help you address the cause instead of just treating the irritation.

Why It Happens

B vitamins like riboflavin, niacin, and B6, along with iron, play a role in keeping skin cells healthy and supporting the immune system's ability to fight off the yeast and bacteria that often move into cracked skin. When these nutrients run low, the skin at the corners of the mouth becomes more fragile and prone to splitting, and it heals more slowly once it does.

What It Looks Like

Redness, cracking, or small sores at one or both corners of the mouth that sting when eating or talking are the most common signs. This is sometimes accompanied by a swollen or unusually smooth, red tongue, or sores inside the mouth, all pointing toward the same underlying nutrient gaps.

How to Manage It

• Include riboflavin-rich foods such as eggs, dairy, and leafy greens

• Add niacin sources like poultry, fish, and peanuts

• Eat vitamin B6-rich foods such as chickpeas, potatoes, and bananas

• Include iron sources like red meat, beans, and fortified cereals

• Keep the area moisturized with a gentle balm, and avoid licking the corners of your mouth

When to Call Your Provider

If the cracking doesn't improve with basic care, keeps recurring, or comes with other symptoms like a sore tongue, mouth ulcers, or fatigue, it's worth checking in with your provider. Bloodwork can identify specific deficiencies and help guide the right treatment.

Takeaways

Cracked corners of the mouth that don't heal with lip balm alone are easy to dismiss, but they can be a sign your body needs more from your diet. Getting enough B vitamins and iron helps keep skin resilient and supports faster healing when irritation does occur. If you're working on rebuilding weight, pairing that effort with nutrient-dense foods can help close the nutrient gaps that often show up first at the corners of your mouth. And leaning on the everyday habits dietitians swear by can make it easier to keep these nutrients consistent long enough to see lasting improvement.