Skin condition under the eyes goes viral as doctors warn it could signal hidden health issue

Dark under-eye circles may be more than a cosmetic concern. Doctors say they can sometimes signal low iron stores — a condition that's gone viral on social media under the name "ferritin face." Experts say there's some truth behind the trend — with important caveats. Ferritin can be thought of as the body's "iron storage vault," according to Dr. Josef Hadeed, a double board-certified plastic surgeon at Hadeed Plastic Surgery in Beverly Hills, California. It is a protein that stores iron inside t