Easy Diagnosis. What you describe sounds like chronic venous insufficiency. It is related to obesity, inactivity, and means the veins are not working correctly allowing the blood to stay in the legs causing swelling, open sores and drainage. It is not cause by bacteria so antibiotics are worthless. Get to a wound care specialist, the treatment is multilayer compression, unna's boots/socks are not effective tx.
It. It sounds like you are dealing with an infectious process. In that case, you will need to be treated with antibiotics, and you may even need debridement of your wounds. Please seek medical attention right away. Best of luck.