Erythrasma is a superficial skin infection caused by Cory-nebacterium, a normal inhabitant of the skin. The infection typically occurs in intertriginous spaces, especially in obese, hyperhidrotic, or diabetic patients (Fig. 33-39). Moderate itching and discomfort may occur, and the infected skin is often reddish brown and may be slightly raised, with some central clearing. The lesions are largely confluent but may have poorly defined borders. Because of the production of porphyrins by the infecting corynebacteria, Wood's light demonstrates the lesions as a coral red. However, if the patient has recently washed the affected area, the coral-red fluorescence may be absent. Erythrasma is often confused with a fungal infection. Erythrasma may be treated with oral or topical erythromycin or clindamycin.
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