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Cataphoresis refers to the use of the positive pole (anode) of a galvanic current to perform iontophoresis with acidic solutions. It produces an acidic reaction in tissues, tightening pores, reducing redness, and soothing skin after desincrustation or extractions. The anode also has a vasoconstrictive effect, reducing circulation and calming irritation. In contrast, anaphoresis (choice A) is the negative pole, which generates an alkaline reaction that softens keratin and emulsifies sebum. Alternating current for muscle stimulation (choice C) relates to microcurrent or faradic applications, not galvanic cataphoresis. Mechanical exfoliation (choice D) refers to microdermabrasion or scrubs. Cataphoresis is often used as the final step of a galvanic facial to restore pH, close follicles, and enhance product penetration of acidic solutions (like vitamin C). Understanding polarity, pH, and tissue response is essential for estheticians to apply galvanic modalities safely and effectively.