Types

 hair shaft structural defects with increased fragility

• moniletrix (beading of hair)
• pseudomonilethrix
• pili torti (twisting of hair)
• Bjornstad syndrome - Crabdall syndrome
• Netherton syndrome
• trichorrhexis nodosa
• trichothiodystrophy
• Marinesco-Sjögren syndrome

 hair shaft structural defects usually without increased fragility

• pili annaulati (ringed hair)
• woolly hair
• acquired progressive kinking of the hair
• Uncombable hair syndrome
• straight hair nevus
• loose anagen hair syndrome

 hair shaft pigmentation anomalies

 other anomalies of the hair shaft

• trichoclasis
• trichoptilosis
• circle hairs
• trichomalacia
• trichoschisis
• Pohl-Pinkus constriction
• tapered hairs
• bayonet hairs
• trichonodosis (knotted hairs)
• trichostasis spinulosa
• multiple hair
• peripilar keratin casts (pseudonits)
• weathering of the hair shaft
• hair shaft longitudinal ridging and grooving
• bubble hair

Hair shaft lesions

 hair shaft nodes

• trichorrhexis nodosa

 paint-brush tip

• trichorrhexis nodosa

See also

 hair shafts