I had patch test with Lightsheer Diode Laser at 3 different laser clinics. Each clinic used the almost same settings. At the first two clinics, they shaved the area and applied gel before treatment. After treatment, my skin got red and some bumps appeared, but I didn't burn. But when I had patch test at the third clinic, electrologist didn't shave and apply any gel before treatment. When she treated the area, I burned and got blister on my skin.
When the similar setting was used with same laser, why did my skin react differently? At the first 2 clinics (which use Lighsheer frequently on clients), I was told that my skin is good for Lightsheer but at third clinic (which uses more GentleYAG on clients), I was told that Lightsheer is not good for my skin. Why is this?