Missing outer third of eyebrows 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 missing outer third of eyebrows, we could:
Does the outside 1/3 of your eyebrow area have little or no hair growth? In other words, do your eyebrows fail to extend out to edge of your eyes?
Possible responses:→ No / don't know