Role of dermaroller-mediated microneedling in hair follicle stimulation and hair growth.

Background: Dermaroller-mediated microneedling is a minimally invasive modality used to induce controlled cutaneous injury and promote hair follicle regeneration. Unlike automated microneedling devices, dermarollers are manually operated, introducing variability in technique and treatment parameters. Objective: To evaluate the efficacy, safety, and procedural variability of dermarolling as a monotherapy for hair loss. Methods: A literature search of PubMed through September 2025 was performed using terms related to dermarolling and hair loss. Studies were included if they specifically evaluated dermaroller devices. Data regarding study design, patient population, treatment parameters, and outcomes were extracted. Results: Three studies met inclusion criteria, including two human clinical studies and one animal model. One clinical study demonstrated a statistically significant increase in hair count and thickness, whereas another reported no significant improvement in hair density or scalp coverage. The animal study showed enhanced hair regeneration, with optimal effects observed at needle lengths of 0.25-0.5 mm. Considerable variability existed across studies in needle length, treatment frequency, duration, and procedural endpoints. Reported adverse effects were generally mild and transient, though improper technique may increase the risk of epidermal injury and scarring. Conclusion: Evidence supporting dermaroller monotherapy for hair loss remains limited and inconsistent. Lack of standardized protocols likely contributes to variable outcomes. Further large-scale, randomized controlled trials are needed to define optimal treatment parameters and establish the safety and efficacy of dermarollling in clinical practice.