Courtesy C-SPAN

His communications director, Adam Jentleson, tells ITK that Reid underwent the skin treatment on Wednesday and routinely gets the unspecified procedure done about every six months to a year.

Jentleson reiterated that the four dark-colored spots aren't indicative of a serious health problem. “It’s nothing,” Jentleson said.

Reid jested about the coloring on Thursday. 

"The marks on my face have nothing to do with fiscal cliff or disagreements between Speaker [John] BoehnerJohn Andrew BoehnerJohn Feehery: A political forest fire Trump's pick for Federal Reserve chief is right choice at right time The two-party system is dying — let’s put it out of its misery MORE and I. It has to do with being very pale and living in the desert my whole life," the senator said. 

Boehner (R-Ohio) reportedly told Reid to "go f--k yourself" during a heated confrontation before a "fiscal cliff" meeting last week at the White House.