Thanks for the query.
One application of permethrin is good enough to cure scabies
The itch usually lasts long,
Sometimes even for a month.
use some antihistamine tablet daily for a month,
you will get good response,
Please meet a dermatologist
and discuss regarding this.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.