Did Skeletor Have a Face?

In the episode "Sword and Staff", Skeletor finds a powerful crystal on Moon Nordor and absorbs its power, making him more powerful and evil than ever before, and changing his appearance drastically, including a yellow face with red eyes, and different armour and helmet, based on the "Disks of Doom Skeletor" toy.

How did Skeletor lose his face?

18 HIS FACE WAS BURNED OFF BY ACID

Keldor was the student of Hordak, leader of the Evil Horde, and ended up staging a coup against the then-Captain Randor in the Hall of Wisdom. Randor and his troops fought back, and he and Keldor became locked in a one-on-one confrontation that saw them equally matched.

Is Skeletor He-Man's uncle?

It has been generally accepted that these two characters are in fact the same man, although this was never directly stated in any canon until the Masters of the Universe Classics line. As a result of Keldor's introduction to the mythos, Skeletor is unwittingly the uncle of his archnemesis He-Man.