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.
Grade I: Perceptible thinning of the hair on the crown, limited in the front by a line situated 1–3 cm behind the frontal hair line.
Grade II: Pronounced rarefaction of the hair on the crown within the area seen in Grade I.
Grade III: Full baldness (total denudation) within the area seen in Grades I and II.
