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This question already has an answer here:

So I have a screenshot for you, of the rear end of my female 3D model, and there in a strange indent going through it. Which only appears when I use a subdivision surface modifier.

And no, I am not talking about here butt crack xD I am talking about the horizontal line that goes all the way around.

It is unique from the possible duplicate due to the fact that it is a horizontal line, and thus is not a mirroring issue.

Here is the image: enter image description here

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marked as duplicate by cegaton, David Feb 19 '17 at 16:04

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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    $\begingroup$ Perhaps there is a gap that was not stitched up perfectly in the mesh. It may be easier for me to identify if you upload your .blend file so that I can directly see what's wrong with it. You can use this link to upload: blend-exchange.giantcowfilms.com $\endgroup$ – SmileyFace Oct 12 '16 at 4:09
  • $\begingroup$ When you have such errors it usually means that the geometry is not connected, so the subsurf stops at the edges. You might have duplicated unconnected vertices. $\endgroup$ – cegaton Nov 12 '16 at 5:38
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Go in edit mode delete the faces (but not the points) where there is the horizontal lines, and then create the faces again.

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