Noma is a severe disfiguring disease of the mouth and face that starts as a gingival ulcer and spreads rapidly through the tissues of the mouth and face. It most often occurs in young, severely malnourished children between the ages of 2 and 5 living in underdeveloped countries. While the exact cause is unknown, it may be due to certain bacteria and is often preceded by illnesses like measles or tuberculosis. Treatment involves antibiotics and improved nutrition to stop the disease from progressing further, and plastic surgery may be needed to reconstruct facial tissues and bones. Preventive measures focus on improving nutrition, sanitation, and cleanliness.