scabies....in a link I posted above it explains what I tried to about people who believe they are not killing the scabies mite, that a woman had used a topical scabies treatment that caused an itching flare up and she was convinced the reactive itching to treatment meant the scabies were still there....and she overdosed on ivermectin in attempt to kill them......as with other parasites
in scabies the often adults and perhaps the larvae? are all that is killed, when they dies they degrade in the skin and cause itching to increase for a time how long depends on how long it takes that persons body to clean it all up, that is why you go by the condition of the skin minus scratching or other self induced injury...
the eggs are not killed and this increases the importance of not scratching to keep from displacing them, if eggs get scratched and relocated somewhere now you have a way to become reinfected again, it is best to leave be and treat the itching sensation then retreat for the life cycle, even if it takes an extra life cycle treatment or two to give you confidence (max 4 single doses at 2 week intervals for each one), it is better than persistent and unnecessary accidental over dosing. Again the best judge if you have achieved killing it is through going by healing of the skin that is cared for and left alone so you are not being tricked by your own immune response. once you are confident your regular contacts look healthy, you have treated adequately in your home and yourself, given adequate time for the immune healing response, the skin looks good,try a new approach, something else is bothering you, if treating really good doesnt fix it, look for other problems that could be causing your symptoms, this would be true for any symptoms....if treating well and doing a good job doesnt work, then it isnt going to work doing more??