Hi. I ve been doing a lot of sitting recently and have developed some edema, mostly in the lower right let. Today the swelling was accompanied by pain at the front of the leg and some numbness in the area. Probably unrelated but I ve also had a breakout of a chronic, undiagnosed ichy hot red rash on the shin. How to I get this under control?
It is possible the rash and the edema are related.  Edema normally develops from an overflow of fluid from your vascular system to your soft tissue area.  Your lymphatics are normally when swell up.  You are very astute to attribute the swelling to increased sitting as the veins of your leg get compressed when you sit making edema more likely.  The edema itself can cause skin change over time such as you are describing.  If you have significant enough swelling, you should consider seeing your doctor, so ultrasound can be performed on the legs to rule out a blood clot.  Edema can otherwise be reduced by reducing your sodium intake(cut down on breads, cheese, and canned food), exercising, and foam rolling the inside of your thighs.  You can also try compression socks to help the blood flow back to your heart.