Hi. Thanks for posting your concern at HCM.
I would keep a possibility of
scabies. Scabies can involve genital areas, thighs , abdomen, trunk, arms,
axilla etc.
Itching is classically more severe at night.
I advice my patients of scabies a single, whole body application(sparing face) of 5% permethrin cream/lotion for 8 hrs (overnight), which is curative in most cases.
An oral antihistamine like
cetrizine would help with the itching associated with it.
It is important to wash all the clothes, bed-sheets, pillow covers, towels and handkerchiefs etc.
It is normally advisable to treat empirically all the family members also simultaneously.
take care
regards