what can cause unexplained itching?
['Skin conditions. Many skin conditions itch, including dry skin (xerosis), eczema (dermatitis), psoriasis, scabies, burns, scars, insect bites and hives.', 'Internal diseases. ... ', 'Nerve disorders. ... ', 'Psychiatric diseases. ... ', 'Irritation and allergic reactions. ... ', 'Pregnancy.']