i DID the lip scar.
it's attatched... hahaha...
(also, heath did NOT do his own makeup, and what was used was a new silicone application technique.
read below:
The Joker's make-up was also a departure from past incarnations of the character. While he retains an allusion to his familiar white-faced, sneering visage, his make-up for "The Dark Knight" was intended to give him a more frenetic look that also lends to its shock value. The Joker's face is covered in a white pancake that is cracked and runny in places. His eyes are thickly rimmed in black, and a sloppy red grin is painted on, extending from his mouth to his cheeks but not quite masking the terrible scars beneath. His hair is a more subtle, but still noticeable, shade of green.
Make-up and hair designer Peter Robb-King remarks, "Clearly, there was a perception in the audience's mind of what The Joker would look like, but we wanted to get under the skin, so to speak, of what this character represents in this story. He is someone who has been damaged in every sense of the word, so it was important that we create a look that was not, forgive the pun, 'jokey.'"
Heath Ledger's make-up artist, John Caglione, Jr., calls the application of the actor's make-up "a dance." He describes, "Heath would scrunch up his face in specific expressions, raising his forehead and squinting his eyes, and I would paint on the white over his facial contortions. This technique created textures and expressions that just painting the face a flat white would not. Then I used black make-up around Heath's eyes while he held them closed very tight, which created consistent facial textures. After the black was on, I sprayed water over his eyes, and he would squeeze his eyes and shake his head, and all that black drippy, smudgy stuff would happen."
The Joker's make-up also represents a revolutionary advancement in the application of prosthetics, developed and executed by prosthetic supervisor Conor O'Sullivan and prosthetic make-up artist Robert Trenton. "They used a brand new silicone-based process that enables the prosthetics to be laid on the skin in such a way that it's seamless," Robb-King describes. "It's absolutely amazing because you can put a camera right up to the face--even an IMAX camera--and there are no issues.")