As i have mentioned before i am huge advocate of the ice bath or my alternative just a bath filled only with the cold tap. Sit in this for 15 minutes and it will work wonders. When your numbness kicks in the the blood flow is reduced to that area, when they recover and the blood flow increases it is done so with re-oxygenated blood which speeds recovery and helps heal any little niggles.
They are not fun in the slightest but trust me they work.
Arrghhhhhhhhhhhhhhhhhhhhhi couldn't do it i just couldn't, ive had a go at one a few years ago and lasted about 30 seconds (no jokes please)