Lucky for you "Alaska, Arizona and California do not address the legality of scarification in the books. So, it’s neither legal nor illegal."
It's actually illegal in NJ
The hard part is finding a reliable person to do it. There is a perfect temperature (~550 F, iirc) that should be maintained during the process or else you risk ripping the skin when pulling off and causing more bubbly scars instead of something nice. Idk much about those branding pens, I'd rather just get a skin removal scarification if I were to go that route.