Chong told Us Weekly, "I'm in treatment now. Either I get healed or I don't. But either way, I'm going to make sure I get a little edge off or put up."
He did not specify which type of treatment he is undergoing.
Chong tweeted the news, writing, "I have good news and bad news. First the bad news, the cancer came back and it's a real pain in the butt. The good news is I now have to use more marijuana to treat the cancer."
Chong, who competed on Dancing with the Stars in 2014, also battled stage-one prostate cancer in 2012.
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