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Since the Orc skin is gotten by consuming Orc Potion, that means you must purchase another potion that is not Orc, to remove it. Lets say you want to be Human again, you will need to purchase the Human Potion.

You can also remove the Orc skin by deleting the Avatar, this will revert your Avatar back to a human without a potion involved.

The potions can be gotten by going to Skin Tyte or Marketplace.