Micro-needling can be safely repeated every 4-6 weeks until you achieve the desired results. For collagen induction, we recommend starting with 3 treatments, but with a minimum separation time of 4 to 6 weeks between treatments. For scar reduction, an average of 3 to 6 treatments is recommended. The number of treatments required will depend on how each individual responds to the treatments, and the extent of the damage at the beginning Micro-needling can be used on all skin parts of the body (neck, décolleté, arms, legs, etc). Most people will begin to see results after the very first appointment.