Small dark line on 3D object

In some skins, a dark line appears on the right arm.
5386014--546015--IMG-20200118-WA0016.jpg 5386014--546018--IMG-20200118-WA0015.jpg

  • AA disabled
  • Point filter
  • Tested with shadows off
  • Orthographic camera
  • No image compression
  • Mobile diffuse

Does anyone know how to solve?

I solved it, the problem was with UV mapping, the front face was slightly to the right.

Yeah. Sometimes a bad UV, or an object not UV’ed, or not UV’ed properly, can cause those strange problems.