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You need to see a vascular specialist. The most common cause for recurrent abscess in the lower leg is peripheral vascular disease, which may be arterial, venous or both. Poorly functioning vessels allow the serous part of blood to seep out into the surrounding tissue, causing (in severe cases) the skin to seep fluid, and causing ulsers which can become infected.
Here are two articles about it. The first is very simplistic and the second goes into mote detail.
Please let me know if you need additional information about this.