POPSUGAR Photography | Melanie MannarinoPOPSUGAR Photography | Melanie Mannarino I’ve always had glorious eyebrows. Dark, full, glossy — really, my only complaint was that they had a bit of a Frida Kahlo vibe toward the middle. It was nothing some strategic tweezing couldn’t handle. I’d also clean up the strays below the browline, but I was never one to overpluck. And yet one day in my 30s I looked at a photo of myself and realized my brows had sort of. . .disappeared. No longer dark nor bushy, they were now just sparse and gappy. I had no idea what happened. I got my thyroid checked. (Healthy, whew.) My derm…