By Antonella Tosti
Dermoscopy - the exam of the outside less than distinctive illumination - has been expanding in attractiveness as a diagnostic investigational strategy, however the epidermis containing hair poses quite diverse difficulties from the outside at the remainder of the physique. This pioneering textual content examines different stipulations that may be investigated and the implications that may be received.
This resource comprises specifically commissioned art tables for ease of reference.
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Extra info for Dermoscopy of Hair and Scalp Disorders: With Clinical and Pathological Correlations
B) Dermoscopy shows dystrophic and exclamation mark hairs. 12 (a,b) Alopecia areata of the eyelashes: dermoscopy shows yellow dots and dystrophic hairs. 13 (a,b) Histopathology of alopecia areata: nanogen and miniaturized hair follicles with dilated infundibulum containing keratin and sebaceous debris, which explain the yellow dot pattern. 14 (a,b) Congenital triangular alopecia: the patch contains vellus hairs – note the absence of yellow dots. 15 (a,b) Alopecia after an insect bite: the absence of follicular openings suggests cicatricial alopecia.
The disease usually affects women, who complain of diffuse hair thinning; alopecia is frequently more evident on the androgen-dependent areas of the scalp. The presence of numerous yellow dots and short regrowing tip-shaped miniaturized hairs (2–4 mm long) is a characteristic dermoscopic feature. The pattern is easily seen at all magnifications. The diagnosis is confirmed by histopathology. 1 (a) Alopecia areata incognita: diffuse hair thinning is more evident on androgen-dependent scalp. 1 (b) For caption, see facing page.
The pull test is very important for assessing disease activity. In acute progressing disease, it shows dystrophic hair with fractured roots and telogen hairs. Dermoscopic features Yellow dots Yellow dots are a characteristic finding of alopecia areata. They appear as round or polycyclic yellow to yellow–pink dots, which may be devoid of hair or contain miniaturized short regrowing hairs, cadaverized hairs, or dystrophic hairs. The presence of yellow dots in hair-bearing areas of patients with alopecia areata can be a sign of disease progression.
Dermoscopy of Hair and Scalp Disorders: With Clinical and Pathological Correlations by Antonella Tosti