Electric cleansing brushes are handheld devices used in dermatology to more effectively clean skin by removing dirt, oil, and makeup. They use oscillating or vibrating bristles to exfoliate dead skin cells, which can improve skin texture and radiance and help skincare products penetrate more deeply. For patients with certain skin conditions, they can be used for therapeutic cleansing, but it's important to select the right type of brush and use it according to skin type and sensitivity.