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To revert back to your own skin (or default Steve skin), right-click on the 'Minecraft Portable' shortcut > open the file's location > navigate into the '.minecraft' folder > open the file 'launcher_profiles' using notepad++ (regular notepad works as well but everything will show up on one line) and replace the UUID (long string with the dashes) with 0-0-0-0-0 and save the changes.
Great info and an easy fix! This worked perfectly. Thank you for the quick reply!