Our expert says:
Some people can get a delayed allergy reaction after a sting. Try taking an antihistamine, but if there is no improvement a cortisone injection/tablets may be needed. Scorpion stings are normally not dangerous, but can cause secondary infection in a limb with blood poisoning so watch out for red, swollen and hot area, or a sign of spreading infection up a limb. If this happens the patient may need tetanus toxoid vaccination and antibiotics.
see also http://insects.tamu.edu/extension/bulletins/l-1678.html
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