Whomp comic: This comic (25/4/2012) deals with what happens when your flesh falls off. Urgh.
Gnoph has a lot of this. When it begins, Abbey is being slowly eaten alive from the inside by her Bond Creature, Scut. Things get progressively worse from there.
In the The Order of the Stick prequel volume Start Of Darkness, Xykon rips away his own flesh as he is transformed into a lich.
8-bit Theater has Red Mage getting raped by and transforming into what can only be described as a "hideous eye thing" and later having partial transformations as he tries to bend the laws of magic in order to hide the fact that he was still a monster.
This is Zexion's speciality in Ansem Retort. He put an Oreo in someone's brain to turn him into a human-cookie...thingjust because he could.
Vladia, (formally Vlad) from El Goonish Shive is a shape shifter whose form was a mishmash of bats, birds, human, an alien race known as Uryuoms, and a freaking leopard, wouldn't change out of her animal form due it being excruciatingly painful, and potentially fatal to take on her human appearance. Even though we don't see the Body Horror, it's very much implied, considering the above and that this is her as a human◊ and is her animal form◊.
In Homestuck, when each character enters the game the antagonists are "prototyped" with a new mutation. When Jack Noirkills the Black Queen and takes her magic ring, he loses an eye and an arm, grows a jester's hat, a cat face, tentacles, and wings, and then grows a sword through his chest. And that's just with three players in the game, there's still one more to come!
It got worse. Jade's Kernel ended up being prototyped with Bec through a series of unfortunate events. We get to watch Jack transform into an almighty godlike being with unfathomable cosmic power. And boy, is it scary.
In the comic Wurr, the hellhounds have been exposed to mutating Black Touch for generations, resulting in strange mutations such as extra limbs, eyes, too many teeth, strange skeletal structures, and countless other strange features. Some hellhounds, called Whispering Ones don't even have proper genetalia.
In Demon Eater, every time a demon eats another demon, the eater's body changes to take in some characteristics of the eaten demon. Demons can also shapeshift at will, but that has happened less often.
Body horror is a possible random side effect triggered by the Shield of Wonder. Notable cases are the guard who was balefully polymorphed into an ogre and cut down by his sergeant, and one who was painfully transformed into a swarm of snakes.
The finger horror spreads a disease called 'liquid rot' to any living thing it touches. The limbs of creatures affected by this disease will transform painfully, before falling off the body and turning into a liquid goop which the horror can feed upon.
In one of the early Looking for Group comics, Richard cast a spell to create skeletons to fight on his side. Said skeletons were still in the bodies of his enemies, which the skeletons hastily extracted themselves from. Did I mention said enemies were still alive?
Mrs. Cho of The Bongcheon-Dong Ghost. Her body is not necessarily strange looking and retains human qualities. It's the fact that she is the reanimated corpse of a mentally unstable woman who committed suicide from jumping from her apartment window that enforces the horror. When Mrs. Cho hit the ground, every bone in her body retained damage of various levels. Some had small fractures but many were split in two. In addition, her forehead most likely hit the pavement but caused no damage to the skull. If that had happened, her head would be destroyed. This injury causes her head to retain its shape while covering it in blood. So to reiterate, she is a walking corpse who broke every bone in her body whose face is covered in blood. The real frightening aspects of the comic are two jump scares when Mrs. Cho turns her head 180 degrees around and runs faster than a cheetah on crack directly at the screen while unsettling noises of bones cracking are heard. Also, Mrs. Cho was a real person who committed suicide.
The Kingfisher features a moderate amount of body horror, especially when new vampires are born, or when a vampire assumes the form of their death.
