Scaly/flaky skin can have various causes, just like most other symptoms. Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.
Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms. In order to diagnose scaly/flaky skin, we could:
Is your skin scaly or flaky in areas other than the top of your head (scalp)?
Possible responses:→ Don't know
→ Definitely not
→ Yes, somewhat
→ Yes, significantly