Combination skin is simply having oily skin in some areas of your face and dry skin in other areas. Typically, there's a mix of oily and dry areas on different parts of your face, with the t-zone (forehead, nose, and chin) being slightly to very oily.
Suggested Microdermabrasion treatment:
Fine Tip (indicated with a single line) with suction level 1(green light will show) do 2 passes over area to be treated.
If your skin is tolerating this level of treatment then move to a higher suction or a medium tip. Let your skin decide!