GentleMax Pro Yag laser hair removal for light skin: Scars? (photos)

Yesterday I had my 2nd treatment. I am from Turkish background and I think I have skin type 3 phototype.My bikini area is 2 shades darker.The specialist is using Yag with smaller spot size for my treatments. I see now some red lines on the upper part of my nderarms, e.g. the initial stages of stretch marks. I am worried these might develop into scars. When I raise my hand I feel pain, which I think is due to irritation of glands underneath. Should I stop my treatments or ask for Alexandrite?