Insects and mites have book lungs which get plugged up by olive oil, and they suffocate.
This is a much safer treatment than pesticides.

Sarcoptes scabiei Mite, causes scabies, also mange in animals.
Head lice,
fleas
ticks, carry lyme disease and rocky mountain spotted fever.
discourages mosquitos, now a carrier of west nile virus

Olive oil application head to feet after bath.
Excellent for general skin maintenance also.