Dry Brushing is a manual form of exfoliation that involves brushing dry skin with a soft-bristled brush. It sits somewhere between a massage and an exfoliating treatment. The bristles slough off dead skin cells and the pressure of the brush combined with the sweeping motions can help to stimulate lymphatic drainage, which helps the body to rid itself of molecular debris. Lymphatic drainage can improve a slew of ailments, including fatigue, headaches, swelling, and the common cold. But remember, there isn't much data out there to say that dry brushing can make a huge difference for these particular issues.
Dry Brushing is recommended on a daily basis. If you have sensitive skin, try dry brushing every other day or a couple of times a week.