In this observational study, researchers found that acute telogen effluvium, a form of temporary hair loss, occurred in 80 patients following COVID-19 infection, with 70 showing a significant decrease in hair density and trichoscopic signs like peripilar sign and yellow dots.
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June 2020 in “IP Indian journal of clinical and experimental dermatology” This study found that yellow dots were the most common trichoscopic finding in adult patients with alopecia areata, observed in 88.5% of cases.
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April 2017 in “Dermatology practical & conceptual” This study reports that yellow dots in a higher number per field of vision were the most consistent dermoscopic finding in severe cases of alopecia areata.
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November 2022 in “Actas Dermo-Sifiliográficas” This study reviewed the usefulness of trichoscopy in diagnosing and monitoring alopecia areata, noting that the technique identifies specific hair features like yellow and black dots, which are linked to the disease's chronic nature and treatment response.
July 2025 in “INTERNATIONAL JOURNAL OF SCIENTIFIC RESEARCH” In this observational study, researchers found that alopecia areata is associated with specific trichoscopic features, such as black dots, yellow dots, and vellus hair, and highlighted trichoptilosis as a potential overlap feature with other hair disorders, suggesting a need for further differentiation between these conditions.