Abstract:

Androgenetic alopecia and alopecia areata are common types of alopecia in clinic. In recent years，laser technology has been developed rapidly，of which the parameter setting and safety of fractional laser therapy for alopecia has attracted more and more attention. Current clinical trials have achieved certain results. Fractional laser can not only change the microenvironment of skin tissue，activate hair follicle stem cells，promote hair growth，but also open the skin barrier and accelerate the absorption of topical drugs. Thus，fractional laser therapy has a promising prospect in non⁃surgical treatment of alopecia. This article reviews the classification，prin⁃ ciple，clinical application and related adverse reactions of fractional laser in the treatment of androgenetic alopecia and alopecia areata.

Key words:

fractional laser, alopecia, androgenetic alopecia, alopecia areata