Efficacy of Platelet-Rich Plasma Versus Mesotherapy in Androgenetic Alopecia: A Retrospective Study

Inclusion Criteria: * Patients who underwent either PRP or mesotherapy at our dermatology clinic during 1/1/2011 and 30/12/2020 * Male patients with a clinical/ trichoscopic/ histologic diagnosis of androgenetic alopecia (stage II to V according to the Hamilton-Norwood Scale) * Female patients with a clinical/ trichoscopic/ histologic diagnosis of androgenetic alopecia (stage I to III according to Ludwig Classification) * Patients receiving no treatment or being treated for more than six months for androgenetic alopecia without change in medication. Examples of medications and interventions include, oral/topical finasteride, oral/topical minoxidil, antiandrogens, hormonal substitution, hormonal contraceptives, phototherapy/laser, cryotherapy, microneedling. * Patients who underwent trichoscopic examination and phototrichographic evaluation with our digital dermatoscope, before treatment, a month after the last injection and 3 months after treatment. * Trichoscopic photos are required to be taken from the midfrontal area and from the vertex -defined as the intersection of the line through the midsagittal line and the line passing through the external auditory canals in the coronal plane. Exclusion Criteria: * Patients with other types of alopecia, other than androgenetic alopecia * Patients with two or more diagnoses of hair loss , for example androgenetic alopecia and telogen effluvium or alopecia areata. * Patients who started concomitant medication for hair loss within s…