Artifact on my model's nose I was following this tutorial for making a 3d avatar from scratch, and found that there was an artefact on the nose of my model. The modifiers used are the mirror modifier along the x axis and the subdivision modifier.
0 subdivisions:

1 subdivisions:

Can anyone explain why this artifact is occurring and what I can do to remove it?
i had the same problem a few months back, my solution to this was checking for duplicate vertex, check if a face on the inside of the mesh is preventing the merge, and recalculate normals, that or your vertex isnt aligned to 0 properly.
most of the time i fixed it by recalculating normals with Shift N
hope it helps