Hi. Thanks for posting your concern at HCM.
I would keep a possibility of
Scabies given that a close contact has had scabies and because of intense nocturnal itching.
Treatment of scabies is 'single whole body application of 5% permethrin' from neck downwards and keeping it overnight for 8 hours and bathing next day.
Since you have already applied permethrin (It is to be applied JUST ONCE ONLY on entire body) and also consumed
Ivermectin, so there is no need for any more miticidal treatment. Itching resolves in a few days after treatment.
I would have advised you to use a topical steroid+antibiotic combination cream twice daily for a few days over the itchy spots.
An oral antihistamine like
cetrizine once daily would help you with the itch part.
It is advisable to treat other family members too for scabies.
All the clothes, bed-sheets, towels, handkerchiefs should be washed/dry cleaned.
take care
regards