I have had two VF treatments. The first treatment felt hot with moments of feeling zapped, like a quick burn. The second treatment was worse. Whenever the technician went in circles it's wasn't too bad but when she went back and fourth the split second of stopping at each end felt like I was being burned and I think I was flinching at times. I am a redhead with freckles and I know I'm sensitive to sun burn but what about other burns. Might my fair skin be the problem?