With shorter needles, derma rolling is quite safe! With 0.2-0.3 mm needles, there’s very little that can go wrong. However, with longer needles, there are quite a few risks. Most doctors don’t recommend using derma rollers with needles 0.5 mm at home. You can damage your skin if you use a longer derma roller with excess pressure, if you fail to disinfect it thoroughly, or if you use it over skin that’s breaking out or experiencing an infection. That’s why we urge a lot of caution if you choose one of the longer-needle derma rollers on our list.