There are 37 species of scorpions in California and toxicity varies with the species. Scorpions native to Arizona and Mexico are the most dangerous. In California, dangerous scorpions are found only in the areas bordering the Colorado River. A sting from a scorpion in geographic areas other than around the Colorado River is not likely to be dangerous. Most people compare a scorpion sting to a bee sting as they both cause a burning pain.
Some people also have some swelling.
Unless symptoms of an allergic reaction appear, there is little to be concerned about. As with any wound, watch for infection. When a mosquito bites, it produces saliva that is irritating when injected into the wound. Mosquito bites cause pain, redness, swelling, and itching. Frequently a small blister or hive develops at the bite site.