I once had a woman come to me
as a patient for an evaluation of a dark rash on the front of her right leg
with mild swelling. She says the rash always stays the same but the
swelling is worse at the end of the day.
The key to her story is that she has almost no swelling when she wakes
up in the morning. She saw a dermatologist who prescribed some antifungal
creams for this rash but it never cleared up. She was very frustrated.
What was this rash?
The official diagnosis
was venous stasis dermatitis from venous insufficiency. Well to break it
down, this is a circulation issue. Not the arteries. She had good
pulses in her feet (pedal pulses) so the arteries were bringing the oxygenated
blood to the feet. This is the most important part of foot health – the
arterial circulation. You must have good arterial circulation to literally
keep your feet but that is another topic.
This patient had insufficient venous circulation. It is easier for the arteries to bring blood down to
the feet with the help of gravity but the veins have to bring the deoxygenated
blood back up to the heart and lungs against gravity. So to help this
venous blood to travel up, there are valves in the veins that push this blood
up. Over time, sometimes these valves get damaged, become insufficient
and cannot do a good job at this so the venous blood pools in the legs and the
legs increasingly swell. Superficial and deep varicose veins develop and
the venous purplish blood deposits some of its contents called hemosiderin
deposits.
This is what is responsible for the “rash” on this patient’s
legs. This is called venous stasis dermatitis. So that is why the
antifungal did not work as it is not a fungus nor did the steroids work as it
doesn’t help the venous blood travel up the leg. If this persists, venousstasis ulceration can develop with the increased swelling as the fluid has nowhere
to go but out and the skin breaks opens.
Increased age, smoking, genetics,
obesity, trauma and pregnancy are all risk factors of venous
insufficiency. Compression stockings
(support hose), pneumatic compression devices, weight loss, elevation and
exercise can all help manage this condition.
Wound care is needed for an open wound (ulceration) and sometimes if severe
enough, referral to a vascular specialist is necessary.