Alopeca Areata (AA) causes small, round patches of hair loss and occurs in nearly 2 percent of the U.S. population. It most frequently affects children and young adults, but can occur in people of all ages, in both genders and every ethnic group. One in five patients has a family with AA.
AA is an autoimmune disorder that occurs for unknown reasons, in which the body’s immune system attacks the hair follicle causing hair loss. It is not contagious.