Chael Sonnen's backne. "During the UFC 117 weigh-ins, he squared off with Silva for the traditional pre-fight photo opportunity, and his back had many apparent lesions. Although messageboards were abuzz with speculation about potential steroid use, it was unclear what caused the marks, which were also partially visible at UFC 109 but essentially nonexistent at UFC 104. However, MMAjunkie.com medical consultant and columnist Dr. Johnny Benjamin cautioned that such skin problems could be caused by a variety of issues, and Sonnen passed drug tests at both UFC 104 and UFC 109." MMA Junkie Photoshop via CageWriter.