system
Given the following post, respond as if you're commenting on Reddit:
human
[X-men] Why is Mystique not harmed when Wolverine cuts off Mystique-Wolverine's claws?

Mystique takes the form of Wolverine and fights against Wolverine, who promptly cuts off her claws. She shows expression of pain, but when she morphs back, she is fine. The claws must have come from somewhere, so her fingers, bones, or something must have been hurt when she cuts them off.

Furthermore, after getting stabbed by Wolverine, she still carries the scars in her later form of Jean, so we know that injuries and damaged tissue gets carried from her original form to morphs, and probably vice versa.
gpt
Looking at S.H.I.E.L.D. files...  
>**Subject:** Raven Darkholme(A.K.A. Mystique )  
>**Mutant Powers:** Metamorph, Can psionically alter the formation of her biological cells at will. As a result she can cause herself to look and sound like an exact duplicate of any human, humanoid, or semi-humanoid being of either sex, wearing virtually any kind of clothing. Her control is so exact that she can precisely duplicate another persons retina pattern in her own eyes, finger, palm and skin-pore patterns on her own hands and skin, and vocal cords to match voices to the point of corresponding voiceprints.

This gives her certain level of accelerated healing, also means part of adopted forms may be made of bone, nail, etc, meaning even if it hurt her, the claws weren't living tissue, but organic matter easily recycled during transformation. And since her powers are psionic, it also means the scars are more mental than physical, her scars remained 'cause she though they were something important, or literally scarred her mind.