Hi,
Due to the longstanding edema, there’s a pressure on the capillaries of the kin which can burst releasing the RBC’s and this can cause the redness of the skin and it can also occur if there’s an inflammation of the foot. A simple test is to see if the skin is warm or not. If it’s warm it indicates an underlying inflammation which is definitely not a good sign.
If it’s not warm, there isn’t much to worry.
I hope that helps. Please do keep me posted. Kind Regards.
Poor circulation would cause the edema. My mom in end stage chf had red palms and red on the bottom of her feet. You should mention this to your doctor. It also could be gout.