They usually crawl up legs and bite up to beltline. Grocer's itch is caused by variety of mites living on produce. Demodex folliculorum Demodex mites have a probable role in folliculitis, rosacea, and demodectic mange in dogs. They are responsible for an inhalant dust allergy. Their venom is both hemolytic and neurotoxic.
Scorpions have a worldwide distribution.
Centruroides sculpturatus and C. gertschi are most common in SW USA, and may produce a fatal reaction. In severe envenomation, a coagulopathy can ensue. The neurotoxin can cause numbness, fasciculation, lacrimation, salivation, sweating, nausea, urinary urgency, and convulsions. Treatment involves removing the stinger if present. If severe symptoms ensue, one can use antivenin, barbiturates, benzodiapepines, atropine.