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ALSO KNOWN AS: Agranulocytosis; granulocytopenia; granulopenia; neutropenia

Acute necrotizing ulcerative gingivitis (ANUG) is a serious infection of the gums that causes ulcers, swelling, and dead tissues in the mouth. Although a painful condition, it can be healed with treatment.

Mucormycosis is a serious infection caused by a fungus that affects the sinuses, brain, and lungs. It occurs most often in people with a compromised immune system, and the prognosis is usually poor, even with treatment.

ALSO KNOWN AS: CGD; fatal granulomatosis of childhood; chronic granulomatous disease of childhood; progressive septic granulomatosis

ALSO KNOWN AS: Congenital spherocytic anemia

With chronic bronchitis, the airways in the lungs experience inflammation. When these airways become irritated, thick mucus forms inside the airways, making it difficult to breathe.

Dacryocystitis is infection of the lacrimal sac, which is located on the side of the nose near the inner corner of the eye. The lacrimal sac drains tears from the eye into the tear ducts leading into the nose. Dacryocystitis is sometimes a congenital condition, which means it is present at birth. The condition affects as many as one-third of all newborn babies.

Leptospirosis is a rare and contagious bacterial infection caused by the bacterium Leptospira. Leptospirosis is most common in warm, tropical conditions and can affect any part of the body. With prompt and proper treatment, prognosis is usually good. If untreated, complications may develop that can potentially be fatal.