Strange shadows on texture

Hello,

I have some strange shadow effects on my model and I can’t figure out where they are coming from.
The problem is not originating from the texture, since when I set the material to shadeless, the problem is gone.
The normals are consistent.

Any idea what is causing this?

Thanks for help in advance!

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Ok, solved it, sorry for opening the post prematurely.

There was an ngon underneath it…