Hair evaluation methods are grouped into three main categories: non-invasive methods (for example: questionnaire, daily hair counts, standardized wash test, 60-s hair count, global photographs, dermoscopy, hair weight, contrasting felt examination, phototrichogram, TrichoScan, and polarizing and surface electron microscopy), semi-invasive methods (for example: trichogram and unit area trichogram), and invasive methods (for example: scalp biopsy). This article explores supporting examinations for the diagnosis of hair disorders.
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