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Impetigo is an infection of the outer layer of the skin, most often caused by certain bacteria. Learn details about causes, symptoms, and treatment.

Iritis is the inflammation of your iris and the anterior chamber of your eye. Iritis can lead to serious problems. It can cause severe vision loss and even blindness.

Keratoconus is an eye disorder in which your cornea slowly thins over time. The cornea also bulges out over time, to form a cone-like shape. Keratoconus causes nearsightedness (myopia) and blurry vision.

Labyrinthitis is the inflammation of part of the inner ear called the labyrinth. The inflammation causes vertigo, hearing loss, and other symptoms.

Left bundle branch block is a problem with the heart’s electrical wiring (conduction) system. Read on for details about this condition.

Lichen sclerosus is a long-term (chronic) skin condition. It causes the skin to become thin, white, and wrinkly.

McArdle disease is a rare muscle disorder. In McArdle disease, the muscle cells can’t effectively store energy. Read on to learn more.

Medulloblastoma is a type of brain cancer. It most often affects children, but it can also happen in adults. These tumors often grow in the cerebellum, the part of the brain that controls balance and coordination.

Microscopic polyangiitis (MPA) is a condition that causes small blood vessels to be inflamed. It's a rare type of vasculitis. The disease can damage the blood vessels and cause problems in organs around the body. Read on to learn about causes, symptoms, diagnosis, and treatment.