Ringworm on leg. Close-up of a classic circular ringworm lesion on a young girl's leg. Ringworm is not caused by a worm but by various species of fungi that can grow in skin, such as Microsporum and Trichophyton. The condition derives its name from the ring-shaped lesions that develop as the fungus grows outwards from a point, leaving a circle of recovering skin in the middle. It is highly contagious, spreading via infected surfaces and often affecting several parts of the body at once. This patient caught ringworm from a horse after 'mucking out'. See M270/153 for the same lesion after treatment with the topical antifungal drug terbinafine.

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