Hair loss significantly impacts patients' quality of life, and it may be nonscarring or scarring. Etiologically, hair loss may be hereditary (androgenetic alopecia [AGA]); related to age; congenital (hair shaft disorders); traction-induced; inflammatory (primary scarring alopecia); autoimmune (alopecia areata); or secondary to medical, surgical, or emotional stressors (telogen effluvium), infection (tinea capitis), and certain medications including cancer therapies.