Scorpion stings

[Britney]

The stings of North American scorpions are rarely serious and usually result in pain, minimal swelling, tenderness, and warmth at the sting site. However, the bark scorpion (Centruroides exilicauda or C. sculpturatus), which is present in Arizona and New Mexico and on the California side of the Colorado River, has a much more toxic sting. The sting is painful, sometimes causing numbness or tingling in the area around the sting. Serious symptoms are more common in children and include

Abnormal head, eye, and neck movements
Increased saliva production
Sweating
Restlessness

Some people develop severe involuntary twitching and jerking of muscles and very high blood pressure. Breathing may become difficult.
(See also Introduction to Bites and Stings.)

[Dave Paprocki]

Although all scorpions in North America sting, most are relatively harmless. The stings usually cause only localized pain with minimal swelling, some lymphangitis with regional lymphadenopathy, increased skin temperature, and tenderness around the wound.
A significant exception in North America is the bark scorpion (Centruroides sculpturatus, also known as C. exilicauda), present in Arizona, in New Mexico, and on the California side of the Colorado River. This species is venomous and can cause more serious injury and illness.
Initial symptoms are immediate pain and sometimes numbness or tingling over the involved part. Swelling is usually absent, and there are few skin changes. Serious symptoms, most common among children, include

Restlessness
Muscle spasms
Abnormal and random head, neck, and eye movements
Anxiety and agitation
Sialorrhea and diaphoresis

In adults, tachycardia, hypertension, increased respirations, weakness, muscle spasms, and fasciculations may predominate. Respiratory difficulties are rare in both age groups.
C. sculpturatus stings have resulted in death in children lt; 6 years and in hypersensitive people.