Oasis Medical now offers the Unna Boot, named after German dermatologist Paul Gerson Unna, who specialized in diagnosing and treating skin diseases. The Unna Boot is a cotton compression dressing with a zinc oxide paste applied uniformly to the entire bandage; zinc oxide does not harden or cake. The zinc oxide dressing in the Unna Boot eases skin irritation, keeps the wound area moist, and promotes healing. It can be used to treat burns, ulcers, and swelling from water retention. It provides about 20–30 mmHG in pressure. In general, the Unna Boot can be used to treat wounds with light to moderate drainage and for patients who are active and can move on their own.