Today I heard (second or third hand) about a real life mutant. Apparently this woman was having some sort of skin issue or trouble breathing. Something like that where the body usually just needs a jump start in order to fix itself.
So the Doctors, just doing their usual thing, give this woman a shot of steroids. Jump forward two hours later and her skin is itching and getting painful. Turns out her hair(like all those tiny little arm hairs and everything) has switched over and is now coming in with fingernail material.
If I remember correctly there isn’t much difference between the two. Just higher levels of keratin or something. It is the same way the spiney ant eater’s scales grow and probably the same as a porcupine’s quills.
So yeah… Porcupine Lass got her powers from a steroid injection.