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Hair casts
Hair casts
Hair casts (peripilar keratin casts, pseudo-nits) are common, small tubular formations of amorphous material of variable shape that surround the hair shaft.1 Their proximal ends are conical and their distal ends are funnel shaped. They appear as yellow/whitish material adherent to the hair. The condition is predominantly observed in women but has occasionally been described in children.2 Kligman described them for the first time in 1957 as scalp pseudoparasites.3
The histologic changes are similar to those seen in androgenetic alopecia.4,7 The hair shafts show flattening and longitudinal channels.8