To be clear, not all lash serums exacerbate under-eye woes. It’s those that include prostaglandin analogues (PGAs) you would possibly need to avoid, Youn shares in a current TikTok video. 

These substances had been initially used to deal with glaucoma sufferers (with a drug referred to as Bimatoprost), earlier than researchers realized these sufferers had grown a lot thicker, fuller lashes. They found that the actives might truly prolong the expansion section of hair; in consequence, PGAs grew to become the hero substances in quite a lot of medical lash serums available on the market. 

However right here’s the difficulty with these PGAs: They’ve additionally been related to periorbital quantity loss, or as Youn places it, “melting” the fats round your eyes. “There was a current examine printed within the Aesthetic Surgical procedure Journal that discovered that that is true,” he shares. 

And fats loss on this space could make the blood vessels below the eyes extra seen, as there is not any longer a buffering layer of tissue—so that you wind up with darker circles.