[Keeper of Dol Guldur]

Sauron could change into fairer, or werewolf/vampire/serpent shape until his body was annihilated at the sinking of Numenor. Then he built a greater darker body for himself after a few years, but it wasn't strong enough because Isildur managed to cut off his finger. After thousands of years had passed, he came back as a great eye wreathed in flame, then a newer supposedly more powerful body-but still ugly, he never regained his ability to look fair. He presumably had blackish (not like humans with dark skin but black) skin and red eyes. He could have been normalish looking (except his eyes) but not after his bodies total mutilation. He was bald in my eyes.