Microdermabrasion works on all skin types and colors. It makes subtle changes, causing no skin color change or scarring. It is not effective for deeper problems such as scars, stretch marks, wrinkles, or deep acne scars. In microdermabrasion, tiny crystals are sprayed onto the skin to gently remove the outer layer of your skin. This technique is less aggressive than dermabrasion, so you do not need numbing medicine. It is basically an exfoliation and skin rejuvenation procedure that leaves skin looking softer and brighter.