"Cortisol face" is a trending topic on TikTok — but what is cortisol, exactly? And can it really impact your face shape? Cortisol is a hormone that mainly helps regulate your body's response to stress ...

Add Yahoo as a preferred source to see more of our stories on Google. It’s not amore hitting your eye. The beauty buffs of TikTok have a new common enemy in cortisol. A condition dubbed “moon face” ...