A Comment on Coronavirus Disease 2019 and the Hair

The document explores the potential link between COVID-19 and hair conditions, focusing on androgenetic alopecia (AGA) and gray hair as possible indicators of disease severity. It discusses the "Gabrin sign" proposed by Wambier et al. to identify COVID-19 patients at higher risk based on AGA, though this hypothesis lacks conclusive evidence. The document also examines postinfectious hair loss, such as telogen effluvium, which can occur after COVID-19 due to systemic inflammation and fever, with recovery typically within 3-6 months. Stress-induced hair loss during the pandemic is considered, but evidence remains inconclusive. The authors emphasize the need for further research to clarify these associations and caution against premature conclusions.