UNTRACEABLE (2008) Diane Lane is an FBI agent who tracks internet crime. She and her partner, Griffin Dowd (Colin Hanks) come across a website that shows someone hooked up to some type of device--and the more viewers who click on and watch the quicker their death happens. One of these involves an anti-blood coagulate, so the guy bleeds to death, another involves many sunlamps and the guy blisters and burns up. The worst, however, is when agent Griffin is captured and put in a vat of water, to which sulphuric acid is added-- and his skin sloughs off.
This movie surprised me because it's along the lines of the SAW movies and I wasn't expecting that. Check it out if you're interested in being grossed out.