The comedian was in court Wednesday in Essex County, New Jersey. We're told he was taken into custody after his hearing after testing positive for cocaine and morphine.

Law enforcement sources say the mark under Lange's nose is a scab that started to bleed.

The same day he was sent back to jail, someone managing Artie's Twitter account announced he would be undergoing a long term treatment program, adding ... "He loves and respects his fans... updates coming soon.. and it’s time."

We broke the story ... Lange pled guilty to heroin possession at the end of 2017 and went to an inpatient drug rehab program after he got out of jail. He was later sentenced to 4 years probation.

The judge also ordered him to complete an outpatient drug program and complete 50 hours of community service.

Lange's latest bust will likely result in a probation violation ... so he's looking at more tough times ahead.

Originally Published -- 10:22 AM PT

11:46 AM PT -- Artie's attorney, Frank Arleo, tells TMZ Artie was "taken into custody so that the Drug Court could re-evaluate him and recommend a course of treatment. Once that is done, he will be released. Artie is committed to getting better."