Final answer:
In a microdermabrasion treatment, short strokes should be used to exfoliate from the middle of the upper lip to the outer part, ensuring precision and minimizing skin damage. The answer for the question is short.
Step-by-step explanation:
During the exfoliate step of a microdermabrasion treatment, from the middle of the upper lip to the outer part of the lip, short strokes should be used. This technique allows for precise and controlled abrasion, minimizing the risk of damaging the delicate skin around the lip area. It's important to employ short, gentle strokes in a manner that ensures even exfoliation without applying too much pressure, which can lead to irritation or skin damage.