https://en.wikipedia.org/wiki/Microneedles

While single microneedling is effective, its skin regeneration effects are significantly amplified when combined with specific bioactive substances. In recent years, the integration of "biological agents" such as platelet-rich plasma, recombinant growth factors, and exosomes with microneedling has become one of the most promising directions in regenerative medicine.

Platelet-rich plasma (PRP) is a concentrated platelet solution extracted from the patient's own blood, containing high levels of platelet-derived growth factor, transforming growth factor-β, vascular endothelial growth factor, and epidermal growth factor. When PRP is delivered into the skin through microneedling channels, these growth factors directly act on fibroblasts, vascular endothelial cells, and keratinocytes, forming a powerful regenerative signaling network. Clinical data show that combining microneedling with PRP for facial rejuvenation yields significantly better results than microneedling alone in terms of increased collagen density, improved wrinkle reduction, and enhanced skin luminosity. Particularly in delicate areas such as the periorbital and perioral regions, the addition of PRP advances treatment outcomes by approximately 2 to 4 weeks.

Recombinant growth factors are industrially produced single or composite growth factors, such as epidermal growth factor and basic fibroblast growth factor. Their advantages lie in controllable concentration, batch consistency, and the absence of individual variability issues associated with PRP. Microneedling combined with recombinant epidermal growth factor has been widely applied in wound healing and scar repair. In a study on diabetic foot ulcers, microneedle delivery of recombinant epidermal growth factor increased wound closure rate from 38% in the control group to 76%, with significantly improved healing quality.

Exosomes have emerged as one of the biggest hotspots in regenerative medicine in recent years. These 30 to 150-nanometer vesicles are secreted by stem cells and contain bioactive molecules such as mRNA, miRNA, proteins, and lipids. Exosomes can modulate gene expression in recipient cells, inducing anti-inflammatory, anti-apoptotic, and pro-regenerative effects. Compared to PRP, exosomes are smaller in size, more stable, and less immunogenic. Preliminary studies combining microneedling with stem cell-derived exosomes for treating hair loss and skin aging have shown promising results: in animal models, the exosome-microneedling group demonstrated approximately a 50% increase in follicular density and about a 30% increase in skin thickness. Currently, multiple human clinical trials are underway.

In practice, physicians need to select an appropriate combination therapy based on the patient's skin condition and treatment goals. For severely photoaged skin requiring strong regeneration, PRP or exosomes are preferred; for mild to moderate aging, recombinant growth factors offer better cost-effectiveness. Additionally, the sequence of procedures is crucial: microneedling is typically performed first, followed by application of the biological agent, with negative pressure or manual massage used to enhance penetration.

The combined application of microneedling and bioactive agents represents a synergistic therapeutic philosophy of "physical pathway + biological signal." Microneedling creates a route to the deeper layers of the skin, while growth factors, PRP, or exosomes deliver regenerative instructions. Both components are indispensable and complement each other perfectly. With advances in exosome purification technology and reduced costs of large-scale production, this combined therapy is poised to become the standard paradigm for skin regeneration treatment in the coming years.