What causes angular cheilitis in infants?

Common causes of angular cheilitis in infants include the following: 1. Viral infection: Such as herpesvirus, adenovirus, and other viruses that can directly cause angular cheilitis. 2. Bacterial infection: Infections caused by bacteria such as streptococcus and staphylococcus are also common causes of angular cheilitis. Bacteria proliferate in the corner of the mouth, leading to inflammation and infection. 3. Licking lips: Infants often lick the corners of their mouths with their tongues, which may cause prolonged exposure to saliva, leading to angular cheilitis. Digestive enzymes and bacteria present in saliva may irritate and damage the skin in the corners of the mouth. 4. Prolonged sucking on pacifiers or thumbs: This behavior may also cause dryness of the skin around the mouth, increasing the risk of angular cheilitis. 5. Insufficient moisture: Dry environments or reduced saliva production can lead to inadequate moisture in the corners of the mouth, making them prone to cracking. 6. Nutritional deficiencies: Deficiencies in riboflavin (vitamin B2) and iron are common nutritional factors. Lack of these nutrients can affect the normal repair capacity of the skin and mucous membranes.