thats was just a american one
"The effects have been described as being first a slight itch, followed in a few seconds by a severe prickling sensation that quickly becomes intense pain. There is a background tingling feeling, on which is superimposed an intermittent stabbing pain, with sharp radiations passing in all directions. The injured area initially becomes red and swollen, the swelling persisting for several hours. The centre part of the area sweats, reaching a maximum after 6-8 hours and sometimes persisting for a day or more. After a time, stabs of sharper pain decrease in intensity and frequency, but the diffuse background pain increases. Touching, rubbing or cold temperatures increase the sensation. Pain spreads to other parts of the body, commonly the opposite limb (referred pain) and may persist for several days in the armpits and groin. It is this background pain that can recur for weeks afterwards.
While the effects lessen in time, changes in temperature, such as exposure to cold water, will bring back the pain. There are products that can provide temporary relief, but there is no known cure, other than the course of time.
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