The forehead of Zeir Anpin The skull’s forehead is a forehead to visit the wicked for their deeds. When this forehead is revealed, judgment masters are roused against those who are not ashamed of their deeds. This forehead is as red as a lily. When the forehead of Atika is revealed in this forehead, it reverts to being white as snow. That time is called universal goodwill.
In the book of Aggadah of Rav Yeva Saba he said, if they are deserving, it is metzach (forehead), Atika’s forehead, that is, the forehead of will. If they are not deserving, the letters are transmuted to machatz (smite) as said, “and shall smite the corners of Moab” (Bemidbar 24:17), that is, it metes out punishment to the wicked, as said above.