Rejuvapen microneedling is a safe and effective procedure if you trust a skilled provider. But like any cosmetic treatment, there may be potential side effects that you should know about. The good news is, they’re generally mild and resolve within a few hours to a couple of days. Some common side effects include:  Redness  Swelling  Tenderness  Bruising  Pinpoint bleeding After your microneedling session, we’ll provide aftercare instructions to ensure you get stunning results with minimal side effects.