Final answer:
Androgenic alopecia in men is identified by progressive hair loss on the scalp, characterized by receding hairline and thinning or balding at the crown. It is caused by genetic and hormonal factors, particularly the effects of androgens on hair follicles.
Step-by-step explanation:
In men, androgenic alopecia, also known as male pattern baldness, is identified by a progressive loss of hair on the scalp. It is commonly characterized by a receding hairline and thinning or balding at the crown of the head. This condition is caused by a combination of genetic and hormonal factors, specifically the effects of androgens, such as testosterone, on hair follicles.