Which of the following is a result of applying high frequency currents to the skin?

Applying high frequency currents to the skin is known for its germicidal effects. This is because high frequency currents generate heat and create a thermal effect that can kill bacteria and germs on the skin's surface. These currents can also create ozone, which is a potent disinfectant, further enhancing their ability to eliminate pathogens. As a result, high frequency treatments are often used in skin care, particularly for acne-prone or problematic skin, to help reduce the presence of bacteria and improve overall skin health.

In contrast, the other options reflect effects that are not associated with high frequency currents. For example, increased blood pressure is not a direct effect; high frequency treatments may often promote relaxation instead. Reduced circulation does not occur as these treatments can stimulate circulation rather than diminish it. Enhanced skin dryness is not a typical outcome either; in fact, high frequency can help with moisture retention by improving circulation and nutrient delivery to the skin.