(1) A compression dressing consisting of a paste, primarily made of zinc oxide, that is applied both under and over a gauze bandage, used on the lower leg for venous ulcers, phlebitis, sprains, and other disorders.
(2) In medicine, Unna's boot is a special gauze (usually 4 inches wide and 10 yards long) bandage, which can be used for the treatment of venous stasis ulcers and other venous insufficiencies of the leg. It can also be used as a supportive bandage for sprains and strains of the foot, ankle and lower leg. The gauze is impregnated with a thick, creamy mixture of zinc oxide and calamine to promote healing. It may also contain acacia, glycerin, castor oil and white petrolatum.
Unna's boot was named after German dermatologist Paul Gerson Unna.