I am getting the Mixto microfractional h20 resurfacing laser next month.... and the doctor has instructed me to begin prepping with retin-a and hydroquinone ( a bleaching agent) for 2-3 weeks before the treatment so that he would be able to perform the procedure more aggressively, hence better results. Is this right??.. I was always under thee impression that retin-a would thin the skin and is unadvisable before laser treatments or chemical peels. What should I do??.. should I start the creams?