Cutaneous manifestations of coccidioidomycosis may be divided into primary and secondary lesions. Since such lesions may be the only evidence of infection, the distinction is important. Primary (inoculation) lesions are rare. Secondary lesions develop from primary pulmonary disease, commonly. An isolated nodule on the scalp was the presenting sign of disseminated coccidioidomycosis in our patient. Because of the rarity of primary cutaneous coccidioidomycosis, cutaneous lesions due to it should alert the physician to the presence of disseminated disease. The clinical spectrum of such lesions is wide. Our patient was an elderly man with a hyperkeratotic scalp nodule clinically felt to be an actinic keratosis or an early squamous cell carcinoma. We suggest that patients with a travel or resident history in endemic areas be viewed with a high index of suspicion for skin lesions of cutaneous coccidioidomycosis. The advent of orally administered imidazole antifungal agents makes early and aggressive diagnosis of these lesions even more important.
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