Combining a microdermabrasion and glycolic peel treatment is a good idea if you have received microdermabrasion or glycolic peels in the past and are seeking a more aggressive treatment. One should expect to have more crusting and peeling than you experience when having either treatment individually. The benefit of combining these treatments is deeper penetration of the peeling agent. Because the skin is first exfoliated through microdermabrasion before the glycolic peel is performed, the glycolic acid is going to penetrate more deeply since several layers of skin have already been removed. I would not recommended this treatment for darker skin tones as there is an increased risk for hyperpigmentation.