Welcome to JA and thanks for this question. I'm sorry to hear about your symptoms. Actually, from the pictures that you have attached, it looks like that you have stasis dermatitis with a superimposed infection in the area. Stasis dermatitis is a condition in which you develop this kind of a rash on regions of the body where the blood supply is not good. This means the veins are not able to move blood back to the heart as well as they should due to either damage to the valves in the area or due to another vascular disease. This would also explain the edema that you have developed over the past few weeks. Basically, this is the first step in the skin changes which occur due to vascular problems, if this is left untreated eventually ulcers will develop at the site which are difficult to heal. Now at the moment, you need various tests to confirm the diagnosis, the first of which would be to get a doppler ultrasound of the area done. This will tell us the exact situation of the veins in the leg. Next, you may need a biopsy of the rash if the diagnosis is not clear. The white portion in the rash is indicative of a superficial infection which needs to be treated with oral antibiotics, the topical silverderm cream can also be helpful here as well.
I would suggest that you do have this evaluated in person by not only a dermatologist but also by a vascular surgeon. In many cases repairing the underlying veins can lead to improvement in the rash as well. In the meantime, you can use compression stocking with a pressure gradient of 15-20 mmHg to help improve blood flow in the leg, continue to apply silverderm however if you can get Mupirocin that would be more useful here. Keep the legs as elevated as you can when sitting down and sleep at night with the legs elevated on two pillows which will help not only with the edema but the rash as well. The rash will need extensive care and various sorts of dressings over the next few months to heal completely.
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