How do I fix this?

Support Modeling
1

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So this happened when I was in sculpt mode using the grab tool. I accidently clicked tab to edit mode. How do I fix this?

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i think ctrl Z ( undo ) would work.

3

From what has been said, this silly face explosion happens sometime in multires sculpting when there are some inverted normals in the base mesh.
So make sure before sculpting with the multires modifier to have a base model that has no inverted normals.

Now why is it not happening everytime and why can it happen sometime (but fortunately very rarely) on mesh that have correct normals, none can really say as there’s no developer anymore working on this modifier unfortunately.