Faint line next to slim character creator skin's arm and head

Summary:
When using a slim skin from the character creator, a faint line appears next to the right side of the player's arm and in front of the player's head.

Steps to Reproduce:

1. Create a new skin in the character creator.
2. Set the arm size to slim.
3. In a world, dig a 2x2 hole and replace the walls with black concrete.
4. Stand inside the hole and look very closely at the right side of the player's arm.
5. Switch to third person front and move the camera around to notice the other line in front of the player's head.

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Original Description:
Bug texture on my skin(right arm and head)