When the tissue becomes affected, non-healing sores or gangrene may occur, which may cause the foot to become red, black or purple.
It should be noted that arterial ulcers can affect anyone, but they are more prevalent among groups of people who have diabetes, high cholesterol or high blood pressure.
This is because these groups tend to have poorer circulation in the feet and legs.
When circulation is hindered, pressure increases inside the veins, according to the NHS.
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