Rash 4 Weeks Post Microablative Co2 Fractional Laser Treatment

the rash started approximately 5 days post procedure. Started as a red, itchy rash on one side of forehead, progressed to both jaw lines, then cheeks. Some became pustules. Tried hydrocortisone cream, light therapy, moisturizers/aesthician, still present but a little improved. Just started on antibiotics. Checks very bumpy. Any help appreciated. Vibraderm prior to tx-could this be the cause? Had tx previously, milder settings,but this is the only difference I can think of.Thank you