Scott Disick has returned to the spotlight after taking a backseat in season two of “The Kardashians.” Disick, Kourtney Kardashian’s ex and the father of their three children, appeared in some of the first scenes of season three of the Hulu streaming series. He was on camera chatting with Khloé and Kim Kardashian, arriving to spend time with the former and discuss a mole on her face she was getting biopsied. (Later in the episode, Khloé discovers the mole is melanoma.) When he…