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Which technique involves the esthetician holding the hand-piece directly on the client's skin?

  1. High frequency

  2. Microdermabrasion

  3. Photoepilation

  4. Direct surface application

The correct answer is: High frequency

The correct answer is A. High frequency. High frequency is a skincare treatment that involves using a small handheld device that emits a gentle electrical current when in contact with the client's skin. This current helps to sterilize and oxygenate the skin, making it a beneficial technique for treating acne and promoting overall skin health. Out of the other options: B. Microdermabrasion typically involves using a handheld device with a rotating abrasive tip to exfoliate the outer layer of the skin. C. Photoepilation uses light energy to target and destroy hair follicles. D. Direct surface application is a general term and does not specifically refer to a skincare technique involving a hand-piece held directly on the skin.