Shadows Weird Triangles on my character

Hi!, im working on a project where the team needs a good skin shader, so im testing pre-integreted skin shader asset.

I was doing a light room sesion on the demo character and unity creates this weird shadows with all kind of lights and i cant get rid of them, i have changed the quality settings, incresing the shadow distance, and tried to change the cascades, i try to render the scene on forward and deffered mode and im using hdr enabled and bloom, SSAO and tonemapping as postfx.

I ve also tried to change all the light settigns, like normal bias or shadow near plane, and i tried to let unity calculate the normals just in case, but nothings.

Is this a unity problem?, some kind of limitation, please i need some advice here ;).

I m using unity 5.3

I leave 2 ScreenShots

*Sorry for my english.

If you want you can contact me on andresonatelosada@outlook.com just in case you want an email.

THANKS!