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What causes trichomycosis nodularis?

Trichomycosis nodularis, or piedra, is caused by an infection of fungus on the hair fibers. The hardened nodules that indicate this infection are made up of the combination of fungal branches (hyphae) and the reproducing bodies of the fungi (ascostroma), which periodically release spores. The different colored nodules are each caused by a different fungus. In particular, black piedra are caused by the fungi Piedra iahortae and white piedra are caused by the fungus Trichosporon beigelii.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.