The general term for hair loss is alopecia. There are many types of hair loss, including male and female pattern baldness, scarring alopecia and alopecia areata. Pattern baldness affects about half of all men by 50 years old. It starts with a receding hairline, and then progresses to a thinning on the crown and temples.Scarring alopecia is normally caused by other conditions. The condition involves the hair follicles becoming completely destroyed.
Coin-sized patches of baldness is usually a sign of alopecia aerate. It’s caused by problems with the immune system.
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