Thanks for providing more information.
As you have radiating numbness and pain in leg,ankle while at certain position so it suggests the possibility of Lumbar radiculopathy(the compression of lumbar nerves L4 or L5 or sacral nerves).
However as the area around ankle is tender to touch and reddish so other possible causes may include Muscle strain,Tendonitis,Mild ankle osteoarthritis.
So you need to consult your regular doctor/Orthopedist for a clinical examination and if required your doctor may advise MRI/X-rays for further evaluation.
In the meantime you can take some self care measures like
Do gentle massage with muscle relaxant ointment and apply warm compresses.
Take OTC Motrin.
Wear Ankle brace for 5-7 days.
Elevate your leg.
If you develop skin discoloration,swelling,area warm to touch,severe pain then visit ER.
I hope this helps.
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