Postoperative excess weight loss (EWL) was found to be a significant factor in the study by Guo et al. [9] Moreover, acute stress, such as surgical trauma, catabolic state after bariatric surgery, and psychological stress due to factors such as stigma and discrimination associated with obesity and surgery [43], may inhibit hair growth through the release of cortisol and substance P-mast cell pathway. The gene discussed is TAC1; the disease is obesity due to melanocortin 4 receptor deficiency.