Clinical results: Hyaluronic acid injection: significant effect, diameter increase of about 1-2cm Autologous fat injection: significant effect, diameter increase of about 1-2cm Biologic patch: mild increase, diameter increase of 0.3-0.9cm Surgical complexity: Hyaluronic acid injection: simple; 15 minutes, do as you go; local skin anesthesia Autologous fat injection: slightly more complex; take autologous fat and transplant, about 2 hours; local infiltration anesthesia or lumbar anesthesia Biopatch: complicated; skin is removed and covered with patch and suture, about 2 hours; local infiltration anesthesia or lumbar anesthesia Surgical safety: Hyaluronic acid injection: safe; no incision, no pain, no infection, no edema Autologous fat injection: safer; only 1-2 injection holes, no incision, no edema; mild hardening of fat extraction area, normal after 2 months Biopatch: some risk; overall complication rate Risks; the overall complication rate is 10-15%, with the risk of poor wound healing, infection and patch removal. Longevity Hyaluronic acid injection: 2 years; mixing with collagen injections will increase the durability Autologous fat injection: 2-5 years; mainly depends on the viability of fat cells; mixing with collagen injections will increase the durability Biological patch: long-term; slow absorption Foreskin flatness: Hyaluronic acid injection: flatter in both soft and erect states Autologous fat injection: occasionally uneven in erect state Biological patch: Flatter in both weak and erect states Foreign use Hyaluronic acid injection: more Autologous fat injection: more Biopatch: less Follow-up satisfaction: Hyaluronic acid injection: 95% satisfied Autologous fat injection: 90% satisfied Biopatch: 80% satisfied Overall recommendation: Hyaluronic acid injection: recommended Autologous fat injection: more recommended Biopatch: optional