American Academy of Cosmetic Surgery

Emerging non-invasive tools for hair follicle assessment: a narrative review on hyperspectral and terahertz imaging

Hair loss, though often dismissed as cosmetic, reflects complex vascular, metabolic, structural, and inflammatory changes within the scalp microenvironment. Conventional diagnostic tools such as visual inspection, dermoscopy, trichoscopy, and biopsy remain limited in their abilit...