What can cause pain and swelling and brusinig of ankle and shin with no noted injury and DVT already ruled out?

Compartment syndrome. A shin splint is a mild form of compartment syndrome involving the most vulnerable compartment, or anterior compartment. A shin splint can occur with regular or mild exercise. It will hurt to elevate your foot. Usually shin splints get better in a few days with rest, stop exercise. If the pain persists, you get numbness or have difficulty raising or wiggling your toes, go see your doctor and ask.