PROMO!!! Choose 1 for €150, 3 for €395, 6 for €725, 8 for €925. Needle Mesotherapy - Derma Pen uses various needles that vertically penetrate the skin. This upgrades the rejuvenation results and is safer for the skin as epidermal damage is minimal. The treatment is also known as Collagen Induction Therapy when a highly concentrated serum is used on the area treated during the session.