Pressure Ulcer - Most pressure ulcers occur when the soft tissue is compressed between two hard surfaces (i.e. the bony prominences and a resting surface: cart, chair or bed.) Circulation becomes impaired depriving the tissue of oxygen and nutrients, which results in tissue death.

Arterial Ulcer - Arterial insufficiency ulcers are usually due to a disease process caused by hardening of the arteries (arteriosclerosis) or by the occlusion of the artery by plaques or fats (arthrosclerosis).These ulcers are frequently located on the lower leg, the foot or the toes.

Venous Stasis Ulcer - Usually result when valves in the leg do not function properly and venous blood does not completely leave the veins, resulting in venous hypertension. Fluid leaks from the vessels and forms edema in the tissue. The swelling and tissue pressure that results causes ulceration, usually located on the ankle or calf.

Neuropathic Ulcer (diabetic) - Results from damage to peripheral nerves (usually from diabetes) causing decreased sensation, which allows for undetected and inappropriate pressure to the plantar surface of the foot. The ulcers occur on the plantar surface of the foot and often present with callous formation.

Surgical Wounds - Surgical wounds that have been closed through primary intention (staples, sutures) are usually quick to heal and form a minimal scar. Surgical wounds that have been left open to contamination or infection heal by secondary intention. Connective tissue must fill in the defect.