The -0.5mm Derma Roller System is effective and popularly known for its benefits for treatment of shallow scars, mild scarring, acne, wrinkles stretch marks, UV damage and skin discoloration. If you have not used previously any micro needling therapy previously you might feel slight tingling or discomfort on your skin. It is advised to clean the surface you are going to use the roller on. Wash, clean and dry the roller and secure it in the case provided for future use. You can use any numbing cream before using the roller. You can also use your favorite serum along for better absorption. Avoid using near eyes or sensitive areas.