Why does my mesh have strange shadows?

Hi, I’m very, very new to Blender. I’ve watched some tutorials and have been trying my hand at making a model of my own. I have been working on retopology and have encountered an issue.

When I Shade Smooth my retopology, it has these strange creases.

I noticed that where the creases are, the edges seem thicker. However, I double-checked and see no double vertices. I even merged vertices by distance just to be safe.

Am I doing something wrong here? Any help would be greatly appreciated!

Have you tried recalculating your normals?

Oh my god, that did it! I should have tried that sooner. Thanks so much!

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No worries :smiley:

If in doubt, always check your normals :wink:

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Quick way is here,

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