HMM: TikTokers are checking for ‘ferritin face.’ Doctors say there’s something to it. “Social media has offered us all plenty of things to be insecure about when it comes to our faces — Instagram face, Ozempic face, cortisol face, runner’s face, pillow face and so on — but with ‘ferritin face,’ there may be something to the trend. The term refers to the appearance of dark circles under the eyes and sallow skin, which could be signs of low ferritin, a blood protein that stores iron. Low ferritin often means there isn’t enough iron in the body and can be a sign of iron deficiency, the most common nutrient deficiency on the planet.”