Postman is right. It is silicone directly injected into the body (face, butt, hips). One can die from an auto-immune reaction to it almost immediately. However there is also the danger that over time, the silicone will break up into clumps and migrate down the body. If the passes through anything important, it can result in serious complications or death.
http://www.tsroadmap.com/physical/si...-websites.html
Here is a good start **Warning some of the pictures are disturbing**