Im cured of itching biting crawling.had it for 7 months.dr said delusionaI parasites (not)....mixed up germx handsanitizer 20 oz. 2 1/2oz of permethrin10% (sold at any farm supply store. And 1 tube of advantix ii blue for dogs 55lbs and over. (sold at pet supply store, petsmart). Shake bottle well.applt 2 x a day showering before application. Put on head to toe on bottom of feet to the scalp getting in ear canals and nostrils. Always use clean towels.and clean clothing everytime.clean sheets or at least pillow cases everynight. Wash everything on hot and dry on high heat. (Do u want to get rid of this then dont care about recking clothes) I did this on myself husband and 13 yr old for over a month when I didnt feel anything more I quit. But cleaned everthing ii ncluding car and never wear anything that has not been washed. Bleach all combs bruses and dont reuse fabric rubber bands. I felt cold tingling. Slight numbness tightness of skin its only temp ears may ring but all itching biting crawling Gone!!