The mesoroller (dermaroller) is a handheld device with a rotating drum covered with hundreds of fine microsurgical needles (typically 0.2 to 0.5 mm for home use). When rolled over the skin in a specific pattern, the needles create micro-channels that stimulate collagen production and significantly enhance skincare product penetration. This training session teaches you the correct technique, pressure, frequency and aftercare protocol for safe and effective home use.