Pediatric allergist Dr Rubin recently took to TikTok to explain the role allergies can play in the formation of dark circles under the eyes. He was responding to another TikToker who was surprised to be told by her doctor that the purple-brown patches of skin coloration she’d assumed were down to a lack of sleep could be “allergic shiners.” The good news? Depending on the allergies, “we can get rid of them.” Those dark circles under your eyes could have nothing to do with lack of sleepIf you’ve been losing sleep over the dark circles under your eyes, and over the notion that the sleep you’ve b…