الفهرس 
List of AbbreviationsOnly 14 pages are availabe for public view
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Abstract
chronic hair loss frequently affects many patients, but there is little or no objective technology available to aid the dermatologist in setting a proper diagnosis and in monitoring treatment efficacy. In particular, it may be difficult to differentiate between androgenic alopecia (AGA) and chronic telogen effluvium. Androgenetic alopecia (AGA) is the most common form of hair loss both in men and women, and is characterized by a progressive reduction of hair diameter, length and pigmentation. It is sometimes difficult to diagnose AGA clinically; thus, dermatologists are searching for new methods to facilitate the diagnosis. Trichoscopy is one of these methods, and AGA is characterized trichoscopically by an increased proportion of thin and vellus hairs, hair shaft thickness heterogeneity, perifollicular discoloration (hyperpigmentation), and the presence of a variable number of yellow dots (YD). In conclusion, dermoscopy is a relatively rapid and non-time consuming technique and the use of a dermoscopy in clinical practice has been shown to increase diagnostic accuracy. Hair shaft thickness diversity of more than 20% was regarded as a hallmark of AGA. The long duration of AGA increases certain dermoscopic findings mainly empty follicle, honeycomb-like pigmented, focal atrichia, pinpoint white dots and yellow dots.