Lord Darth Nihilus (according to "The Record of Sith dignities") did not have his face "removed". His species is Noalark, the sith species other than Maraluka. Nihilus's face is still there but, it is not of Human features. the black behind his mask is a Royal Face Cloak from the Royal Family he was born from. And the mask was made after the Jedi Civil War. The mask was constructed after Malak and Revan fought and both died. After appearing from hiding, Nihilus went to Malachor 5 and took Revan's skull (Revan was the "all-mighty sith back then) and constructed a mask from it (now Nihilus's "face") a few years later he under-took an Apprentice named Visas-Marr, a maraluka, after feeding on her planet. ("The Maraluka world" as Kreia put's it in Kotor2, was the world that the jedi went to meet on the feeling of the "hole in the force"). I'n Kotor1 and Kotor2 you can see Nihilus making this Mask. In Kotor2 when you defeat Nihilus, you can take his mask and then go back to Revan's Tomb and revive Revan (Mod).
Sincerely, Lord Darth Nihilus :3
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Not without modding.
You have to kill Darth Nihilus, plant the four proton charges in the correct positions (shown on the map menu), and escape via where you entered at.
look at Revenge of the Sith Chancellor Palpatine was talking about Darth plaguies when he said life he looks directly at Anakin's face and you almost expect him to say "you" so Darth Sidious saw his master Darth Plaguies creating Anakin Skywalker. Darth Sidious saw that Anakin will replace him as Darth Plaguies' apprentice so Darth Sidious killed him in his nap.
Mentioned in the movies: Darth Plagueis Darth Sidious (Senator/Chancellor Palpatine) Darth Maul Darth Tyranus (Count Dooku) Darth Vader (Anakin Skywalker) In the Expanded Universe (comics, novels, games, etc.), there are dozens more, e.g. Darth Bane, Mara Jade, Asajj Ventress, Darth Talon, Darth Sion, Darth Malak, Darth Revan, etc.
The picture above is what Darth Vader looks like without his mask. He is very pale without almost powdery white skin, red-rimmed eyes, and scarring on his face and head.