Paris Jackson -- Deep in Dark World of Cutting

Paris Jackson will be in treatment for months, for a dark depression that is putting her life in serious jeopardy ... TMZ has learned.

We're told Paris' family is scoffing at law enforcement claims that her "suicide attempt" earlier this month was merely a cry for help. We're told when the bandages on her arm were removed, the damage was "horrifying." As one source put it, "Paris absolutely tried to kill herself, and it wasn't the first time."

Our sources say Paris is deep into the world of cutting. We've seen Paris' Tumblr page, and it's filled with pics of death, suicide and cutting. Several pics show teenagers putting guns in their mouths. As for cutting, the pics are graphic and very bloody. In one pic you see a girl with scissors cutting her arm with a caption, "I f**king hate myself."

Another pic shows an arm with writing over the cutting area that reads, "Suicide slice here."

In one posting, there's a piece of paper with the following type: "Why did you try to kill yourself?" The answer: "You told me to be happy."

And there are other photos of young girls who have just cut themselves and blood is everywhere.

And it looks like Paris reached out from time to time to get help, because there are several postings which have anti-cutting messages.

Family sources tell TMZ ... Paris is "doing better" at UCLA Medical Center but is still in denial and is fighting therapy. Although she has no desire now to cut herself again, we're told professionals are warning the family they need to figure out the triggers that plunge her into darkness.

Sources tell us ... Paris will move from UCLA to another treatment center, and she could be there for 3 months.