Venous stasis ulcers appear as wounds with a red base and irregular borders, according to Cleveland Clinic. These ulcers are shallow wounds that result from a condition called venous insufficiency, explains WebMD.
Venous stasis ulcers may also have a yellow fibrous tissue covering, according to Cleveland Clinic. Green or yellow discharge may be present if the ulcer is infected. The amount of fluid drainage can be significant from these ulcers. Skin surrounding these wounds is usually discolored and swollen. Surrounding skin may have a warm feeling and appear shiny and tight from edema.
Venous stasis ulcers begin as an area that turns dark red or purple, according to WebMD. This area may also be thick, dry and itchy. An ulcer subsequently forms if the area is left untreated. Ulcers that become infected may have an odor to them. Legs with venous stasis ulcers may also be swollen and achy.
Venous stasis ulcers occur when leg veins do not return blood back to the heart properly, explains WebMD. This venous insufficiency occurs as a result of damaged valves. Blood backs up and pools in veins, and fluid leaks from the vein into the surrounding tissue. The surrounding tissue subsequently breaks down, leading to the development of an ulcer.