I decided to do do laser hair removal, I am doing my armpits, Brazilian, and full legs. I prepaid for 9 sessions and when they were checking checking me out the “register“ asked if I wanted to tip. I selected no because I was initially taken back by that especially considering the overall cost. I figured I could tip at each session if I decide to. I’ve never done anything cosmetic so maybe tipping is the norm and I just don’t know. I do tip on other cosmetic services like haircuts, nails, and facials. The place that I’m having it done at is a med spa and it will be done by an aesthetician if that makes a difference. If I do tip what do you guys recommend? 15-20%?