A Split-Scalp Study Evaluating the Efficacy and Safety of Fractional Laser Therapy With and Without Exosomes in the Treatment of Androgenetic Alopecia

Inclusion Criteria: 1. Male pattern baldness diagnosed according to the Norwood-Hamilton classification III-V 2. Males aged 18 to 50 years 3. Willing to provide written informed consent and possessing the ability to read, write, speak, and understand 4. Able to follow the study's treatment guidelines Exclusion Criteria: 1. Those who have taken oral Finasteride, Dutasteride, or Minoxidil within 6 months prior to the start of the trial. 2. Those who have used any topical or systemic medications that may affect hair growth within 6 months prior to the start of the trial. 3. Those who have received phototherapy, laser therapy, exosome therapy, or hair regrowth injections (such as minimally invasive procedures) within 6 months prior to the start of the trial. 4. Those with a history of hair transplant surgery. 5. Those suffering from other systemic or scalp diseases that may affect hair growth (e.g., iron deficiency anemia, immune disorders, thyroid diseases, and syphilis). 6. Those with a history of severe inflammation, keloids, malignant tumors, or poor wound healing at the treatment site. 7. Those with other diseases that make them unsuitable for fractional laser treatment. 8. Those with a history of malignant tumors or currently undergoing treatment. 9. Participants must not undergo any cosmetic procedures that may affect scalp condition or hair growth throughout the entire trial period, including hair dyeing, perming, bleaching, scalp exfoliation, deep scalp cleansing, or any other actions that may irritate or damage the scalp.