These faces were grouped together automatically. They are likely the same person. Tag the cluster to assign all of them in one go.
Not a real person? If this cluster is actually non-face noise (reflections, patterns, animals, photos-of-photos), mark the whole thing as not-a-face in one click.
Come back to it later? If this is a real person you don't want to deal with right now, ignore the cluster. The faces stay searchable via Find but won't appear in clusters or review.