Summary

• Inflammation of the angles of the mouth, characterised by fissures, scaling, erythema, and crusting.
• Aetiology is multi-factorial and includes mechanical factors, infectious agents, nutritional deficiencies, or inflammatory dermatological conditions.
• Diagnosis is made clinically; however, laboratory tests help to identify aetiology.
• Successful therapy is based on identifying and correcting each and all factors of this multi-factorial condition.