On light microscopy, the shaft of woolly hair is oval and its diameter is significantly less than in normal hair. Hutchinson et al. reported that the shaft of woolly hair was smaller than that of normal hair. Wright et al. found that the ovality of woolly hair was larger than that of straight hair; the woolly hair index of ovality was 1.55, and that of normal hair was 1.3. In our case, the woolly hair index (1.5) of ovality was similar to that of Wright, et al..
Inconsistent scanning electron microscopic results have been reported: while Wright et al. found no scanning electron microscopic abnormalities, Crosti and Menni reported absences of the cuticle, trichorrhexis nodosa and occasional nodes. Lopez et al showed oval and triangular hair shaft sections and longitudinal grooves without abnormalities of the cuticular structure. Goldin et al showed twisting of the hair shaft and abnormal cuticular formation. The investigators also reported the presence of triangular cross sections and canaliform dystrophy similar to those reported in spunglass hair.
Our patient had a marked flattening of the hair shaft with twisting and cuticular structure abnormalities. Distinguishing woolly hair from curly hair may require the evaluation of hair shafts by either light or electron microscopy. The study of woolly hair with light microscopy revealed ovoid cross sections, 180-degree longitudinal twisting, trichorrhexis nodosa and pili annulati. Normal curly hair in the scalp has been described as oval in shape, without descriptions of twisting or trichorrhexis nodosa. Shallow longitudinal grooves can be seen, and are typical findings in the normal curly hairs of the pubic and axillary region. silagra tablets
No specific treatment was administered because there is no effective treatment for woolly hair. In some patients, however, the woollv hair may become darker and less curly with time. Our patient, however, had shown no significant changes since birth.