<unk>  is a defect in the hair shaft characterized by thickening or weak points (nodes) that cause the hair to break off easily. This group of conditions contributes to the appearance of hair loss, lack of growth, and damaged-looking hair.
Trichorrhexis nodosa
Trichorrhexis invaginata
Steatocystoma simplex
Leontiasis ossea
Naegleriasis
Acne conglobata
Dioctophyme renale
Elephantiasis nostras