I've been following the BlenderGuru's tutorial, I'm at the last part of level 2. unfortunately I found this weird line (looks like'N's) on the inside of my donut. I've just finished doing texturing using nodes. I've no idea where it came from.
One major deviation from the tutorial I did is applying a decimate modifier to lessen my vertices (subdivide subsurface modifier too much).
The Second picture showcases the problem using viewport shading.
EDIT: Included the UV map of the donut. Hope it helps