It seems that you may be having atopic dermatitis
Your skin would be dry.
There are so may allergens , which can cause dermatitis.
Soap,water,dust,fume,cosmetics,deodorants.clothes...etc might cause the disease.
may exacerbat the disease
Soap should be avoided in bath.
Antihistaminics may be taken to relieve itching.
cream or tacrolimus oint to improve the disease.
I hope you got my answer.
Dr. Ilyas Patel MD