When saliva gets trapped in the corners of your mouth, it dries out skin that can crack. So cracking at the corners of the mouth can be caused by a variety of nutritional deficiencies, for instance, a look of iron, which means that skin cells are unable to regenerate as quickly leading to broken skin. So you might lick your lips often and warmth and moisture in the corners create the perfect conditions for infections because the Infection is the most common cause of these cracks.
If it happens too often, please don’t hesitate to go to a doctor.
7. Dry and chapped lips