Angular cheilitis is a condition that causes red, swollen patches in the corners of the mouth where the lips meet and make an angle. It can cause painful, cracked sores and is caused by irritation to the area that leads to an opening in the skin. Often, yeast enters the skin and inflammation results. Saliva gets trapped and builds up in the corners of the mouth, and when it dries, the skin in the area can crack. Licking the lips often to soothe the cracked skin can create the perfect conditions for fungus to grow and multiply, causing infection.

There are many causes of dry, cracked lip corners that can trigger angular cheilitis, including dry weather, excessive saliva in the form of drooling or lip licking, eczema, allergic contact dermatitis, dentures that don’t fit, mask wearing, the use of pacifiers, and in some cases, a vitamin B12 deficiency. Lip balms or Chapstick will sometimes worsen the condition.

There is no specific product mentioned in the search results that can be used to treat angular cheilitis. However, some treatments include ointment, medication, and diet changes. It is important to avoid using skin-care products in the affected area, as it may only intensify the problem.