How common is this skin sensitivity to chameleons, and what exactly causes it?

So i’ve had my veiled chameleon for a few months now and every time i hold him i get these bumps wherever his nails grabbed onto me. It’s super itchy but goes away within a few hours, definitely worth suffering to spend some time with my chameleon lol. I’m literally allergic to everything so i’m not surprised with my reaction but i’m just curious as to how common this is and what exactly causes it? Also, why chameleon nails? I have 5 leopard geckos and their little nails don’t irritate my skin. Any kind insight is appreciated!