[Need help with fixing a strange glitch]

other people see it as well

[Need help with fixing a strange glitch]

I have tried several things to fix it, I changed skins, shapes, clothes, put them on one at a time, I took all alphas off.  I Tried different viewers, cleared cache, messed about with graphics settings  and still nothing.  

[Need help with fixing a strange glitch]

So 2 days ago everything is going fine and I decide to put on a new tattoo I got, then for some reason I get this horrible invisible gash down the side of my left leg and it won't go away no matter what I do. I have never had this problem before and I doubt it's anything to do with my graphics card or viewer.

Here is a pic of what it looks like, please help.

http://gyazo.com/6a3e142c8109ab785581321cabce32f7