Conflict of interest: none declared.
Coudability hairs: a revisited sign of alopecia areata assessed by trichoscopy
Article first published online: 23 OCT 2009
© 2009 The Author(s). Journal compilation © 2009 British Association of Dermatologists
Clinical and Experimental Dermatology
Volume 35, Issue 4, pages 361–365, June 2010
How to Cite
Inui, S., Nakajima, T. and Itami, S. (2010), Coudability hairs: a revisited sign of alopecia areata assessed by trichoscopy. Clinical and Experimental Dermatology, 35: 361–365. doi: 10.1111/j.1365-2230.2009.03510.x
- Issue published online: 19 APR 2010
- Article first published online: 23 OCT 2009
- Accepted for publication 15 January 2009
Background. We have previously reported several trichoscopic (dermatoscopic) characteristics, such as black dots, ‘exclamation-mark’ hairs, broken hairs, yellow dots and clustered short vellus hairs as being useful clinical indicators for alopecia areata (AA). ‘Coudability hairs’, which are normal-looking hairs tapered at the proximal end, have been previously reported as another sign of AA.
Aims. To use trichoscopy to evaluate coudability hairs as a clinical indicator for the disease activity of AA and a substitute-marker for the hair-pull test.
Methods. Trichoscopic examinations of hair loss and perilesional areas on the scalps of 100 East Asian patients with AA were performed using a dermatoscope. Using Spearman’s rank-order correlation coefficient by rank test, we examined the correlations of scores between coudability and AA disease activity, severity or duration and other trichoscopic features, and then evaluated the coudability score as a surrogate-marker for the hair-pull test.
Results. Coudability scores correlated positively with AA disease activity, hair-pull tests, short duration, black dots and exclamation-mark hairs, and correlated negatively with short vellus hairs.
Conclusions. Coudability hairs, more closely perceived by trichoscopy, are useful-markers for disease activity in AA and provide a surrogate-marker for the hair-pull test.