ABSTRACT
This section brings together some distinctive conditions, both hereditary and acquired, that have characteristic and diagnostic hair shaft changes.
1. PILI TORTI
Literally translated, the term ‘‘pili torti’’ means hair twisting. This sign can occur as a specific genodermatosis with no other demonstrable abnormality (1), as one component of many complex ectodermal syndromes, and as an acquired sign of focal scarring alopecia.
