causes of hair discoloration
The documented causes of hair-shaft discoloration include certain disease states, medications, and exogenous chemicals. The predominant cause of yellow hair, or xanthotrichia, has been determined to be exogenous chemicals. Some of the compounds implicated in yellow hair discoloration include selenium sulfide 2.5% (anti-dandruff) shampoo and dihydroxyacetone (found in self-tanners).