For what purpose can high frequency current NOT be used?

High frequency current is primarily utilized in esthetics for various skin treatments and conditions due to its ability to stimulate tissue, enhance blood circulation, and promote healing. However, the correct option indicates that high frequency current is not suitable for application on human tissue in general.

High frequency treatments are particularly effective for conditions like acne, oily skin, and aging skin because they can help disinfect, improve skin texture, and stimulate cellular activity. While it can be used on hair, skin rashes, and warts, the caveat lies in its application on human tissue broadly.

Using high frequency treatment on open wounds or inflamed tissue can create adverse effects, as this type of current can be too stimulating and may result in increased inflammation or discomfort. Thus, while high frequency can have beneficial effects for specific skin conditions and applications, it is not appropriate for general use on human tissue, especially when considering sensitive or currently compromised areas.