A red flash during treatment is usually normal. This device uses red-light IPL technology, so the red flash means the IPL pulse is being emitted. Please make sure the flash window is fully touching clean, dry, freshly shaved skin, and start from Level 1. Do not use it on tanned, irritated, or broken skin. If the red light appears as an error warning, the device stops working, or you feel burning or strong pain, please stop using it and email a short video to [service@freyara.com](mailto:service@freyara.com) so our after-sales team can check it for you.