Small cut outside anis. Bit itchy but no pain. Can it be herpes? Had rash 2 days ago on other buttcheeck. Dr thinks it's shingles & swabbed 4 herpes.

Probably not herpes. Herpes usually only occurs on one side of the body or the other, so going from one "butt cheek" is highly unlikely. Go back to your doctor and have him/her look at the new lesion.