Diagnostic Modalities in Trichology - An Update

Hair and scalp examination has earned a deserved place in dermatology, the techniques for which can be divided into 3 categories: Non-invasive methods (e.g: questionnaire, general examination, inspection and palpation of the scalp, daily hair counts, standardized wash test, 60-s hair count, global photographs, hair weight, trichoscopy, phototrichogram, trichoscan and polarizing and surface electron microscopy), semi-invasive methods (e.g., trichogram and unit area trichogram) and invasive methods (e.g., scalp biopsy). This article reviews an update on all these modalities.