A fungal infection in which the fungus grows within the hair shaft itself rather than on the surface, commonly causing ringworm and other dermatophyte infections.
From Greek 'endo-' (within) and 'thrix' (hair), used in mycology and dermatology to classify fungi that invade hair from inside, as opposed to 'ectothrix' which grows on the hair surface.
Endothrix fungi are sneaky—they hide inside your hair shafts where topical creams can't easily reach them, which is why ringworm infections caused by endothrix types are often harder to treat than surface infections.
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