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Leukoplakia

This is a white patch on the lining of the mouth that will not rub off or scrape away and cannot be put down to any other known cause.

Lichen planus

Lichen planus is an inflammatory condition in which the immune system attacks the body's own skin and mucosal cells.

Lichen sclerosus

A chronic inflammation of the skin that turns it white, thin and fragile. It affects mainly the skin of the genitals and around the anus.

Lipoedema

A long-term condition in which fatty tissue grows to its own painful pattern: symmetrically, almost always on the legs and sometimes on the arms, while the…

Lipoma

A lipoma is a benign growth of fatty tissue that develops under the skin. It is one of the most common soft-tissue tumours and one of the most harmless: it…

Listeriosis

A food-borne infection caused by the bacterium listeria. In a healthy person it usually passes as a short bout of upset stomach, or causes nothing at all.

Liver cancer

"Liver cancer" is really two different diagnoses under one name, and the difference between them decides everything that follows: where the illness came from…

Liver disease

The liver is patient to a dangerous degree. It can keep working after losing a large share of its tissue and can partly rebuild itself, so disease runs for…

Long COVID

For most people COVID-19 is over in two or three weeks. For some it is not: the cough and the fever go, and the exhaustion, the breathlessness and the…

Long QT syndrome

This is an uncommon quirk of the heart's electrical system: the muscle takes longer than usual to recover between beats.

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