Hello, and thank you for your medical question on e Health Forum.
To begin with, you need to verify the reason behind your skin and scalp itching. The exact cause will be known better with a complete additional history as well as physical examination.
The possible causes for skin itching include allergy to external or internal stimuli, reactions to medications, and many more. It could also be a simple case of seasonal dry skin, not requiring any medication. Use of skin moisturizers can help you in this case.
The scalp itching if associated white flakes, could be due to Dandruff which causes the scalp skin to become dry, flaky and very itchy. However, scratching your scalp, might further worsen the itching. Dandruff can be treated with special, medicated shampoos. You must maintain a certain level of hygiene and you must shampoo regularly.
You might consider to consult a dermatologist who can diagnose your exact condition and recommend treatment accordingly.
I hope you find this helpful.
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