Thanks for posting your query.
Itching of your arms and thigh and your family members are also having similar problem means that you are suffering from Scabies
. If you are having pets in your house it may be due to animal scabies.
But scabies is usually not manifest over ear and face. Then you have to think of the other possibility as Seborrheic dermatitis
You better consult your Dermatologist
as early as possible as you are having ichy lesions and it may lead to secondary bacterial infection and other complication due the secondary infection.
He/ she will diagnose the exact problem and treat you properly.
Get well soon.