What is high frequency current primarily used for?

High frequency current is primarily used for various electrotherapy treatments, making this choice the most accurate. This type of current creates thermal and physiological effects in the tissue, which can be leveraged for multiple beauty and therapeutic purposes.

High frequency equipment generates oscillating electromagnetic currents that produce heat in the skin, which promotes increased blood circulation, facilitates the elimination of toxins, and encourages cell turnover. This is especially useful for treating conditions such as acne, as it can help sterilize the skin and reduce inflammation, demonstrating its versatility in different treatment protocols.

The other options, while related to skin and muscle treatments, do not capture the full range of applications of high frequency current as effectively as the chosen answer. While muscle building, skin hydration, and pain relief can be outcomes in specific scenarios, they are not the primary focus or function of high frequency therapy. The versatility of high frequency in addressing multiple skin issues through electrotherapy solidifies its standing as a foundational tool in beauty treatments.