Dark Blobs in Edit Mode When Zoomed Out Fresh cube mesh was added, and shaped into a rectangular shape. Dark blobs appear to be showing when the mesh is selected in edit mode, zoomed in enough, and with the subdivision view to 2.



When object mode is selected the blobs disappear and the mesh appears normal.



Also, when zooming out enough, the dark blobs begin to disappear.

Is this a graphical glitch, or is this a problem with the mesh itself? The mesh is very new, just pulled faces and extruded 2-3 times. Thanks!
It's perfectly ok. 

You are seeing it because mesh after using Subdivision Surface modifier cross boundaries of your low poly model and those have color with very low opacity but still visible.

Also they are dark because of your selected Blender theme which is if I'm not wrong 'Graph'.

If you don't like this appearance you can always switch to different theme.