The skin may become red/irritated if your skin is sensitive or if too much pressure is applied when using the AMP MD Derma-Roller. We recommend lessening the pressure you apply, and rolling slowly across your skin using longer sweeping lines. Do not pivot or change direction without lifting the roller off the face. The AMP MD Derma-Roller is not recommended for use on very sensitive skin. Sensitive skin, by definition, has a compromised barrier and could benefit from skin protectant ingredients such as dimethicone and allantoin, as found in the SOOTHE Sensitive Skin Treatment.