This is limited details and more precise information is needed about your skin condition which can help in planning a treatment. A thorough history, clinical examination and appropriate laboratory tests will be needed to solve the mystery. A better photograph would have been helpful. Consider seeing a Dermatologist for proper diagnosis and treatment plan. A lot of dryness is visible on these photographs, I would suggest to use a good moisturiser like Venusia or something similar regularly. The medications are to reduce itch and can be adjusted based on your requirements.
Your dermatologist will decide a treatment plan for you after a consultation.