Donut Icing doesn't seem to clip correctly I've been following the Blender Beginner Tutorial, but when I've reached the donut icing, there are weird darker pixels on it. Putting the Clip Start lower as he did in the tutorial only seems to make it worse, putting it higher only makes it limitedly better.
Scale the icing to be larger. If you used the solidify modifier, it's now intersecting with the donut. Or move the icing up. Or the solidify modifier wasn't 'thick' enough and it's intersecting with itself.