Hi, thanks for your enquiry. Rejuran and HIFU (High-Intensity Focused Ultrasound) are two popular aesthetic treatments used for skin rejuvenation and tightening, including around the eyes. They work differently and can even complement each other in some cases. Here's a breakdown of how each works, and what to expect when targeting the delicate eye area: 1. Rejuran An injectable skin treatment derived from polynucleotides (PN), which are fragments of salmon DNA. It works by stimulating collagen production, improving skin elasticity, reducing fine lines, and enhancing hydration. For the eye area: Rejuran i is a specific formulation designed for the under-eye region. Helps reduce fine lines, dark circles, and crepey texture. It’s particularly good for repairing thin, damaged skin and boosting elasticity. Benefits: Improves skin texture and hydration. Safe for delicate areas like under the eyes. Minimal downtime—mild swelling or bruising may occur. Number of sessions: Typically 3–4 sessions spaced 3–4 weeks apart, with maintenance every 6 months. 2. HIFU A non-invasive procedure that uses focused ultrasound energy to heat the deeper layers of skin, stimulating collagen production and tightening. Works at the SMAS (superficial muscular aponeurotic system) layer, which is deeper than most other non-surgical treatments. For the eye area: Special HIFU handpieces with smaller focal points are used around the eyes. Can lift and firm the brow, reduce sagging, and improve crow’s feet. Suitable for mild to moderate laxity. HIFU first (stimulate deep tightening). Wait 2–4 weeks. Begin Rejuran injections (enhance skin quality). Hope this helps.