Medical conditions such as diabetes, poor blood circulation, hypertension, excessive rubbing, venous insufficiency and toenail cuts can all cause ulcers on the feet and legs, as stated by Cleveland Clinic. Diabetic ulcers occur due to impaired feeling in the feet, arterial ulcers commonly result from poor circulation.
Peripheral neuropathy, a type of nerve damage in the lower extremities commonly associated with diabetes, often causes foot ulcers because the patient does not receive warning about pain and discomfort affecting the feet, according to Drugs.com. Tight-fitting shoes or foreign bodies such as sharp debris and pebbles may pierce or rub against the foot, leading to open ulcers. Conditions that cause poor circulation decrease blood flow to the feet, reducing healing ability and making the skin more prone to injury. Artherosclerosis is one such condition.
Fractured feet, claw feet and feet affected by severe arthritis, can also lead to ulcers, as confirmed by Drugs.com. Raynaud's phenomenon is a risk factor for foot ulcers characterized by sudden episodes of poor circulation in the toes and finger. Ulcers rarely occur without an underlying condition, so patients should consult a doctor immediately if they notice an open wound on the foot with or without signs of infection.