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What is Androgenetic Alopecia or AGA?
AGA, or androgenetic alopecia, is a disease characterized by the loss of hair in a characteristic
pattern (see the Norwood Scale and the Ludwig Scale for the most common types of pattern hair loss). It
normally affecting the hair in the frontal, temporal, vertex and crown regions of the scalp while
leaving hair on the sides and back of the head intact. It is most likely genetic in origin and is
initiated by the interaction of a hormone called dihydrotestosterone (DHT) with the androgen
receptors on hair follicle cells, called dermal papillie. This interaction gradually causes the
hair to miniaturize over successive hair growth phases, to the point where the hair becomes tiny
and almost invisible. The disease mostly affects men, but women can be affected as well. AGA is
also referred to as male pattern baldness.
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