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Swollen feet after a sunburn many years ago
While the sunburn surely caused a local injury at the time, that injury should have healed a long time ago. Therefore it seems to me the cause of your edema has yet to be found. The most common local conditions that cause edema are varicose veins and thrombophlebitis (inflammation of the veins) of the deep veins of the legs. Problems with your heart, liver or kidneys may also cause peripheral edema. If blood tests have excluded your heart, liver and kidneys as a source for your edema, you need to look for local problems with either the veins or lymphatic system in your legs.
Lymphatic obstruction (Lymphedema) is caused by a blockage of the lymph vessels that drain fluid from tissues throughout the body and allow immune cells to travel where they are needed.
You can read more about pitting edema here:
You can read more about peripheral edema caused by Heart Failure here:
Your veins can be checked with an ultrasound exam, but an evaluation for lymphedema requires CT or MRI scan, even Lymphangiography.
It appears you need at least an ultrasound to look at the veins in your legs. Depending on the outcome, other tests may be necessary to find the appropriate treatment for you.
Hope this helps,
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