Small flaws in the mesh

[UnPandaRojo]

Hi to everybody again.
I have had this problem for days and I do not know how to solve it, and it is that when I upload the mesh to SL, these small errors are shown with certain WLs that are not noticed in Blender:

I already checked the mesh many times and it does not have double vertices, vertices are joined, it also does not have false faces, the mesh is already smoothed and  does not make steep angles to display like this.

Thank you for reading.

Edited May 17, 2021 by UnPandaRojo

[Wulfie Reanimator]

What I might do in a situation like this is separate out one of the problem areas (like the neck) and try uploading it on its own to see if anything changes. If it doesn't change, you could share the isolated piece to let us take a look at it.