Fed up with speculation about whether she’s had plastic surgery, Selena Gomez took to social media to make it clear she has not gone under the knife – but she has dabbled in Botox, RadarOnline.com can reveal. The Only Murders in the Building star, 32, responded to TikToker Marissa Barrionuevo, who regularly comments on celebrities and whether or not she thinks they have undergone plastic surgery. When Barrionuevo speculated what Gomez might have “gotten done” to her face, Gomez clapped back: “Honestly, I hate this. I was on stripes because of flare-up.” Gomez suffers from Lupus and Stripes is …