What cause lips fissure?

* Dryness: The most common cause of lip fissures is dryness. This can be caused by a number of factors, including:

* Exposure to cold, dry air: Cold weather can cause the lips to become dry and cracked.

* Sun exposure: UV rays from the sun can damage the skin on the lips, making them more susceptible to cracking.

* Dehydration: Not drinking enough water can cause the lips to become dry and cracked.

* Certain medications: Some medications, such as chemotherapy drugs and retinoids, can cause dry lips as a side effect.

* Nutritional deficiencies: A deficiency in certain vitamins and minerals, such as iron, zinc, and vitamin B12, can lead to lip fissures.

* Dermatitis: Dermatitis is a condition that causes inflammation of the skin. Atopic dermatitis (eczema) is a type of dermatitis that can affect the lips, causing them to become dry, cracked, and inflamed.

* Licking your lips: Licking your lips can actually make them drier, as the saliva evaporates and takes moisture away from the lips.

* Smoking: Smoking can irritate the lips and make them more susceptible to cracking.

* Medical conditions: Certain medical conditions, such as Crohn's disease and lupus, can cause lip fissures as a symptom.

If you experience lip fissures, it is important to see a doctor to determine the cause and get the appropriate treatment.