Promising to be a miracle fix for under-eye bags, wrinkles, and stubborn fat, a decades-old cosmetic procedure is making a dramatic comeback. But doctors are warning that the treatment, which leaves people looking like scaly reptiles, can cause irreparable damage, including scarring and blindness. Mesotherapy might sound futuristic, but it’s far from new. First introduced in 1952 by a French doctor, it was originally intended to “relieve pain.” But today, it’s been rebranded as a fast fix for beauty woes – and…