Grey's Anatomy makes you want to claw our eyes out.

Just kidding ... unless you're Demi Lovato. The guest star was obliged to as part of her role on the show next month. As you can see, her patient character is not in a good place - mentally or physically - as evidenced by these self-inflected scratch marks:

Demi Lovato Tweeted this picture for all to see.

In case you haven't heard, the Disney Channel star and girlfriend of Joe Jonas plays a schizophrenic, but she's in good hands with Dr. Alex Karev (Justin Chambers).

The dramatic episode airs May 13, one week before the two-hour season finale.

Follow this link for scoop we previously reported regarding Demi on Grey's.

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.