๐ ็ธฝ็ฎ้ ๏ฝ ๐ ่ฑๆๅๆ๏ผๆฌ็ฏ๏ผ ๏ฝ ๐ ๅฎๆด็ฟป่ญฏ ๏ฝ โญ ็ฒพ่ฏ็ญ่จ
INTRODUCTION
In this chapter, the major non-cicatricial alopecias will be reviewed first, followed by a discussion of cicatricial alopecias and then a review of structural hair shaft abnormalities. Chapter 68 reviews the structure and function of the hair follicle as well as regulation of the hair cycle. Table 69.1 outlines the information of importance in the evaluation of alopecias while Figs. 69.1 and 69.2 depict a clinical approach and the diagnostic tests that can be performed in addition to the clinical examination. The decision to perform trichoscopy, histopathology, hair shaft analysis, and blood tests is guided by the differential diagnosis.
Fig. 69.1 Clinical approach to more common causes of scalp alopecia.
Table 69.1 Clinical approach to the patient with alopecia. TSH, thyroid stimulating hormone.