Smokers: Blood carries oxygen that is needed to
heal wounds. Smoking causes the blood vessels to get narrow and
decrease the blood flow to a wound, which decreases the oxygen that
the wound should get.
Diabetics: Over time, diabetes changes the
blood vessels, inhibiting them from supplying needed oxygen to the
wound site.
Vascular disease patients: Vascular disease
conditions affect the blood flow in blood vessels. If blood flow is
slowed or kept from getting to the wound, then it will not
heal.