There should be no confusion here. God set the mark of the dark skin upon the Lamanites, while the people of Amlici marked themselves with red.
“Souls Filled with Guilt and Remorse”
Addressing himself to those who suppose that they can enter the kingdom of heaven unworthily, Moroni said: “Behold, I say unto you that ye would be more miserable to dwell with a holy and just God, under a consciousness of your filthiness before him, than ye would to dwell with the damned souls in hell. For behold, when ye shall be brought to see your nakedness before God, and also the glory of God, and the holiness of Jesus Christ, it will kindle a flame of unquenchable fire upon you.” (Mormon 9:4-5.)