A longitudinal groove was seen running the length of the hair shaft (Figure 3). On cross section, the hair shaft had a triangular configuration (Figure 4).
Uncombable hair syndrome is an uncommon, distinctive defect of the hair shaft that is characterized by unruly scalp hair. The condition was first named cheveux incoiffables by Dupre et al1 in 1973. Stroud and Mehregan2 coined the term spun glass hair because of a resemblance to the synthetic, spangled hair seen in toy dolls.
A Change in Hair Color and Texture in a Healthy Girl. Arch Dermatol. 2002;138(5):689–694. doi:10.1001/archderm.138.5.689