Arterial ulcers develop as the result of damage to the arteries due to lack of blood flow to tissue.Arterial ulcers often form on the outer side of the ankle, feet, heels, or toes. They can form in other areas, too. These ulcers are painful and have a “punched out” appearance.
Diabetic foot ulcers almost always form on the soles of the feet, where skin is subject to constant pressure. Under the weight of the body, skin deteriorates and eventually becomes an open sore.
These ulcers frequently form underneath calluses and cannot be felt due to diabetic neuropathy.
Venous ulcers develop from damage to the veins caused by an insufficient return of blood back to the heart.Venous ulcers usually form below the knee and on the inner area of the ankle. There’s sometimes little or no discomfort, unless the ulcer is infected. In other cases, venous ulcers can be painful.