Cheilitis generally is dryness and often an uncomfortable sensation of the lips with scaling and cracking, and accompanied by a characteristic burning sensation. For all we know you could be suffering from Angular Cheilitis. It is a condition with deep cracks and splits at the corners of the mouth. If severe, the splits or cracks may bleed when the mouth is opened and a shallow ulcer or a crust may form.
Possible causes of angular cheilitis include:
Infection - Fungal infections are the most common, but viral or bacterial infections can also occur.
Nutritional deficiency of vitamin B.
Over-closure of the mouth in someone who has been without teeth or dentures for some time.
Contact allergy
Atopic or seborrhoeic dermatitis
Iron deficiency
Treatment depends on the cause and can include lip lubrication, antifungal and antibiotic medication, vitamins (especially Vit.B complex), and dentures for a person without teeth.