Background: trichoscopy is a non-invasive office technique used for differentiating cicatricial from noncicatricial alopecia. Trichoscopy helps the dermatologist for diagnosis of alopecia with rarely need of histopathology. Hair loss is distressing problem and associated with psychological complications. Common causes of hair loss include Alopecia areata, Tinea capitis, Traction alopecia and trichotillomania. Objective: this study aimed to assess the trichoscopic features in the Egyptian patients with patchy hair loss and to find sensitive and/or specific trichoscopic findings that can help in their diagnosis and follow up. Methodology: our study included 500 patients categorized into two groups cicatricial (176 cases) and noncicatricial (324 cases). Cicatricial included four types 2ry alopecia 139, DLE 24. FD 5 &LPP 8 and non-cicatricial included five types AA 148, localized androgenetic 21, CTA 15, TC 117 and TTM 23. Results: in our study, the sensitivity and specificity of trichoscopic patterns were evaluated in diagnosis of PCAs and NCAs. We found some trichoscopic patterns that were sensitive and specific for making diagnosis of PCAs. The perifollicular scale had 90% sensitivity and 99.5% specificity for a diagnosis of PCAs. Hair tufting was only observed in LPP and FD. This study showed 100% specificity for the presence of each blood vessel pattern that was seen in PCA. The specificity of tortuous branching vessels was 100% for a diagnosis of DLE. Conclusion: dermoscopy was very useful to identify signs of early clinical response, adverse effects and markers of disease activity even if that couldn't be detected by unaided naked eyes.