Tinea capitis: Potassium hydroxide (KOH) preparation

KOH preparations of hairs from tinea capitis lesions. Left: Ectothrix infection (Microsporum canis). The hair shaft is encased in myriad small spores. Right: Endothrix infection (Trichophyton tonsurans). The hair matrix is packed with spores.

Courtesy of John T Crissey, MD.

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