Edge in edit mode looks darker than the rest

Hi, I was modeling some random eyebulb and I noticed some weird edge shadow: I thought nothing of it because the mesh is quite low poly, but in edit mode I saw it was darker than all the other. I’m quite ignorant in modeling (I’m more of a sculpt girl) so I tried everything randomly: clear sharp, clear seam, clear everything, check the normals and recalcuated them, but it’s still blackish while the others are grey. Does anyone know why it happened and how can I fix it? Thanks!

I guess there is some extra geometry, maybe from an extrude left. Check it by moving the edge an look it there is more geometry.

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I can’t help but feel quite stupid, there were three edges under there… thank you very much!