What type of current is referred to as high frequency?

High frequency refers specifically to a type of alternating current (AC) that oscillates at a high rate. This current is characterized by its rapid cycles, typically in the range of 1 MHz and above. In the context of esthetics, high-frequency AC is commonly used in various treatments due to its ability to enhance skin metabolism, promote blood circulation, and assist in the healing of certain skin conditions.

The application of high-frequency current often produces a mild sensation and is associated with benefits like disinfection and oxygenation of the skin. It is particularly effective for dealing with acne and other skin imperfections, as it can kill bacteria and improve skin texture.

In contrast, direct current (DC) flows in a single direction and is primarily used in different types of treatments, while pulsating current involves a fluctuating flow that may not achieve the same benefits as high-frequency alternating current. Static current refers to a non-flowing charge and does not pertain to the type of electrical currents used in skin treatments. Thus, alternating current is aptly identified as high frequency in the context of esthetics.