What is the difference between alopecia areata and androgenic Alopecia?

Alopecia areata and androgenic are common diseases of the hair follicle that heavily impact the self-image and self-esteem of a person. The difference between the two is while alopecia areata is caused by an autoimmune reaction, androgenic Alopecia occurs because of the heightened sensitivity of scalp follicles to dihydro-testosterone.