Fig. 4.
Olsen´s classification. Olsen patterns incorporate the accentuation of the front-overtical alopecia, which has a triangular or Christmas tree form with hair loss in a triangular form in the front-overtical area (Olsen, 2002).
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.