Comment on Seasonal Hair Shedding

The document discusses the phenomenon of seasonal hair shedding, particularly focusing on telogen effluvium (TE) and its impact on women. It highlights that TE can be influenced by environmental factors such as photoperiod, leading to seasonal fluctuations in hair growth and shedding. Studies have shown that hair shedding peaks at certain times of the year, with a notable increase in telogen hairs at the end of summer. This seasonality complicates the assessment of hair growth-promoting treatments, as it can lead to false-negative or false-positive results depending on the timing of the study. The document emphasizes the importance of understanding these seasonal patterns for accurate diagnosis and treatment of hair loss conditions like female androgenetic alopecia (FAGA).