Synthol is really the most messed up thing you can do to yourself. The risk / reward ratio is so out of balance that it's like russian roulette.
That 1" won't be worth it, in the long run. Even if it ends up at the right spot, but what happens when you get an injury, get old or can't work out for any other reason anymore?
It will look like you got some weird lump and need surgery to have it removed.