5 Facts you should know about

Alopecia areata

Approximately 2% of the global population suffer from AA over the course of their lifetime.

It can affect all age groups, but typically occurs by age 40.

It affects people of various racial and ethnic backgrounds.

The pathophysiology involves multiple immune effector cells, including CD8+ T cells and natural killer cells.

The inflammation around the hair follicle is driven by inflammatory cytokines, which may lead to hair loss.

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