Tiny needles are penetrating your skin, so obviously you want to disinfect those needles first. Soak the roller in 70% isopropyl alcohol. Leave it for 10 minutes.  70% is better than 99% because it doesn't evaporate as quickly. After it's soaked for 10 minutes, pull it out, and shake off the excess alcohol. Let it air dry for a few minutes. It's important to start with clean skin. For example, you could use a gentle foaming cleanser for your face to thoroughly clean your skin. Bar soap or shower gel and water for other parts of your body are fine. The point is you need to start with clean skin, and it's fine to use your typical cleansers. However, you don't want to start with anything too harsh, so skip facial cleansers with things like salicyclic acid in them. Opt for something gentler. Longer needles mean deeper penetration, which in turn can lead to infection. If you're using needles longer than 0.5 millimeters long, you should disinfect your skin in addition to the roller. Gently swipe rubbing alcohol (70% isopropyl) all across your skin.
عقمي الديرما رولر قبل الاستخدام. نظفي بشرتك بالماء الدافئ. عقمي بشرتك عند استخدام إبر طويلة.