6 days post ankle sprain, my foot ankle and bottom of leg go numb. especially if i stand on it for a whilst. no fracture or torn ligaments only sprain?

Ankle Sprain: An ankle sprain is really a misnomer in that there are typically ligaments torn (partially or fully) around the ankle. The tearing from those ligaments may cause swelling (mild to severe) and the swelling may impinge on the surrounding skin nerves. This may be causing the numbness, especially when standing because fluid naturally builds up lower with gravity. Hope this helps, good luck!

Nerve issue: Your numbness can be due to abnormal nerve function due to nerve impingement or damage. Treatment varies depending on the cause of the problem. Have it evaluated and appropriately treated.