Pierre Robin in 1923 is credited as being the first to describe Robin sequence: a small jaw, leading to a tongue that falls back in the throat and upper airway obstruction. Cleft palate is not an obligatory finding, it occurs in up to 90% of...

Benign pigmented skin lesions and melanocytic nevi (moles) are common in children and adolescents. Benign pigmented skin lesions include:...

A pilomatrixoma (PY-lo-may-trick-SO-mah), also known as pilomatricoma, is a slow-growing, usually non-cancerous, skin tumor of the hair follicle. It is most common on the face and neck, but it may be on other parts of the body....

A pilonidal cyst is an abnormal pocket originating in the skin that usually contains hair, skin debris and other abnormal tissue. A pilonidal cyst is almost always located near the tailbone at the top of the cleft of the buttocks. For more information or to...

Pityriasis rosea (pit-uh-RI-uh-sis RO-zee-uh) is a mild, common rash. It causes the skin to become scaly, pink, and inflamed. The rash can last from 1 to 3 months and usually leaves no lasting marks. This rash is not contagious....

The Pediatric Plastic Surgery Department performs the full spectrum of corrective surgical and non-surgical procedures to repair congenital deformities and acquired physical abnormalities. Learn more about children’s corrective surgeries at St. Louis Children’s Hospital....

Pleuropulmonary blastoma (PPB) is a rare type of childhood lung tumor. It can begin in either the lung tissue or the chest cavity and can occur in very young children....

What are plugged milk ducts? A plugged duct feels like a tender lump in the breast. Some mothers seem to be more prone to developing them. Usually they happen when a mother goes too long without emptying her breasts. Or, if insufficient milk is removed...

What is pneumonia? Pneumonia is an inflammation of the lungs caused by bacteria, viruses, or chemical irritants. It is a serious infection or inflammation in which the air sacs fill with pus and other liquid. Lobar pneumonia. This affects one or more sections (lobes) of...

What is a pneumothorax in children? A pneumothorax is an air leak in the lungs. It’s when air from the lungs leaks into the chest area. The leak may start suddenly or may develop slowly. It often occurs in the first 24 to 36 hours...