The symptoms you describe do indeed sound like the Tyndall effect, which can occur after dermal filler injections, particularly in areas with thin skin such as under the eyes. The Tyndall effect is characterized by a bluish discoloration resulting from the light scattering through superficial placement of the filler. Here are some key points and recommendations: 1. Understanding the Tyndall Effect: It occurs when hyaluronic acid fillers are injected too superficially under the skin, causing light to scatter and create a bluish tint. 2. Causes and Considerations: The use of a cannula might have led to a more superficial placement of the filler compared to needle injections, which could explain the change in technique resulting in the Tyndall effect. 3. Management Options: Hyaluronidase Treatment: This enzyme can be used to dissolve the hyaluronic acid filler, effectively reducing or eliminating the bluish discoloration. Consultation: Schedule a follow-up consultation with your injector or a board-certified dermatologist or plastic surgeon to assess the situation and discuss treatment options. 4. Prevention in the Future: Ensure that future filler injections are placed at the appropriate depth by an experienced practitioner to minimize the risk of the Tyndall effect. 5. Monitoring: Keep an eye on the area for any changes or additional symptoms, such as swelling or pain, and report these to your healthcare provider. It is advisable to contact your healthcare provider to discuss your symptoms and explore possible corrective measures. They can provide tailored advice and treatment to address the discoloration effectively.