This is a simple, HOW TO on Joker's Scars. I had a few people ask me how I made mine and the honest truth is, it's just practice. Knowing where to flatten and make the skin rise.
I hope this helps someone out there.
EDIT: I completely forgot to add the final touch! A picture with the scar on real skin. If it wasn't red, it would blend better but that's the basics of it. If you want to know how to apply it to the skin, it's really simple. You just stick on your skin (Spirit gum to hold it if you're going to wear it for over an hour) and smooth out the edges. The Fake Skin is already very sticky and will stay in place 90% of the time.