Are There Indicators of Future Complications from Fraxel Repair?

I am considering Fraxel Repair on my face, neck, chest for fine lines and crepiness. I have allergies, atopic dermatitis, and asthma (all well controlled with oral meds and monthly Xolair), as well as multiple drug allergies. My skin is light to medium in color, I am 52 years old and of mixed European descent. The scars that I've acquired over the years are hypopigmented and a few hypertrophic. Am I at greater risk for scarring, delayed healing, hypopigmentation or other complications due to any of these factors with Fraxel Repair? How can I tell? My dermatologist of 27 years has treated over 100 patients with Fraxel Repair and he would be the one performing the procedure.