@Pepe with hair - I'd say my scalp is tender immediately after. Maybe a touch itchy. More on the burning side though as you describe. That's my sign to say I did actually wound. Sometimes I think I'm not doing that much... and then at the end I'm like... oh, my scalp is angry, I guess I did okay. Hairline does have some action, although nothing all that aesthetic or super obvious yet. Random hairs popping up at the hairline though for sure.