I think I would see a dermatologist.
maybe but check a skin doctor
Here is some causes of your problem, Chemical irritation, Senile pruritis, Atopic dermatitis, Contact dermatitis, Infestations, Infection, Candida infection, Obstructive biliary disease, Chronic renal failure, Malignancy, Medications, Neurodermatitis, Diabetes, Peripheral nerve damage, Cholestasis disease of pregnancy,Underarm rash, Scabies, Psoriasis.
Have you changed your laundry detergent?