Tinea Corporis

Key Points
Skin infection which typically affects the legs, arms, or torso
Caused by infection with a dermatophyte fungus
Consists of red, inflamed patches accompanied by severe itching

Tinea corporis, or ringworm, is a skin infection that typically affects the legs, arms or torso. The condition may present in two forms, acute and chronic. Acute tinea corporis presents suddenly and spreads rapidly, and consists of ring-shaped patches of redness and inflammation, which may be accompanied by pustules or scaling. Chronic tinea corporis typically appears in skin folds, and can be difficult to treat if the condition is widespread. In rare cases, lesions may become abscessed (kerion), presenting as a soft, pustular mass accompanied by satellite lesions.

Tinea corporis is caused by an infection with a dermatophyte fungus. Infection is typically acquired through previous infection of the feet or nails or contact with an infected animal. Anyone may experience infection, regardless of age, gender or ethnic group.

Differential Diagnosis (Other conditions with similar appearance)
Dermatitis
Candidiasis, Cutaneous
Parapsoriasis
Erythema annulare centrifugum
Pityriasis rosea
Erythema multiforme
Psoriasis
Erythrasma
Granuloma annulare
Granuloma faciale
Syphilis
Impetigo

Diagnosis
Key Points
Diagnosis based on appearance of the affected area
Cultures and microscopy of the affected area may be performed to confirm diagnosis

Tinea corporis is typically diagnosed based on the appearance of the affected area. Laboratory cultures and microscopy of the affected area may be performed to confirm the diagnosis.

Treatment
Localized cases resolve quickly with treatment
Treatment typically consists of topical antifungal medications
Severe or widespread cases may require systemic treatment

Localized cases of tinea corporis resolve quickly with proper diagnosis and treatment. Treatment typically consists of the administration of a course of topical antifungal medications. Severe cases, or chronic cases which become widespread, may require treatment with systemic antifungal medications. Surgical draining may be required if lesions become abscessed.