I'm sorry to say but I had a burning sensation during the treatment, pretty unpleasant and I had an allergy reaction hours after the treatment. I was advised to do a patch test but also asked if I was allergic to hair dye, which I'm not, so we went ahead. My bad, I should had been more cautious and cancel the appointment. The skin under my lower eye lashes were ever so slightly stained blue, I hope it fades soon.