Cracked corners of the mouth can be caused by nutritional deficiencies (especially vitamin B2 deficiency), fungal, bacterial and viral infections, chronic trauma and trauma to the corners of the mouth, allergic reactions induced by contact with allergens, dry and hot environments, spicy, fried, barbecue and other foods that can easily get hot, and habits such as licking the corners of the mouth can also lead to cracked corners of the mouth.
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