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strange dark patches in meshes in editmode

please help me in fixing it...I have followed the steps very accurately from the tutorial but I don't know why its been like that...

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    $\begingroup$ can you provide blend file? $\endgroup$ – Chris Jun 17 at 12:42
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    $\begingroup$ Looks like "Z-fighting". At this stage the icing is single-face thin. We can see that with subdivision applied it's going through the doughnut mesh. The places with the glitches seem to be places where the icing and the dough mesh faces are overlapping in the same place, so the 3D software doesn't know which one to render "on top" and some glitches appear. If you will add a solidify modifier you don't need to worry about it because the icing will have a thickness and the visible faces won't overlap with the dough. If not, you can just move up the verts in the parts that are clashing. $\endgroup$ – Alexandre Marcati Jun 17 at 13:16
  • $\begingroup$ @Chris I have now attached the blender file to it...I use a MacBook air m1 as my system... $\endgroup$ – Alone walker Jun 17 at 15:47
  • $\begingroup$ @AlexandreMarcati but I had previously build it on another laptop following exactly the same steps, why hasn't it happened then??... $\endgroup$ – Alone walker Jun 17 at 15:50
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    $\begingroup$ @AlexandreMarcati thanks for your help I've understood and fixed it... $\endgroup$ – Alone walker Jun 17 at 18:32
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I downloaded the blend file to take a look. As I suspected, it's a simple case of "Z-fighting".

At this stage the icing is single-face thin. We can see that with subdivision applied it's going through the doughnut mesh. The places with the glitches seem to be places where the icing and the dough mesh faces are overlapping in the same place, so the 3D software doesn't know which one to render "on top" and some glitches appear. If you will add a solidify modifier you don't need to worry about it because the icing will have a thickness and the visible faces won't overlap with the dough.

If not, you can just move up the verts in the parts that are clashing to avoid overlapping faces.

Original:

enter image description here

Move the verts up a bit:

enter image description here

Or just add a solidify modifier:

enter image description here

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