The diagnostic challenge of nonburrowing mite bites. Cheyletiella yasguri.

Endemic pruritus in a family of four proved to be caused by the "bite and run" habits of the Cheyletiella yasguri mites that lived on the family dog. The mystery was solved only after the 6-year-old daughter experienced an explosive attack of pruritic papules after taking a nap in the dog's sleeping box. Virtually invisible ectoparasites remain a common cause of endemic pruritus within families. Since these patients show no acarologic, clinical, or laboratory evidence for the cause fo their itch, a good rule remains, cherchez le chien.