This report is essentially normal. You should expect your doctor to tell you this and to recommend no further treatment for this particular mole. You need have no extra concerns as a result of having this biopsy result.
Please ask your dermatologist to corroborate this, since some pathologists use words differently. But "mild cytologic atypia" is present in many moles that mean nothing.
Take care.
Dr. Rockoff
Dr. Rockoff