Yes, you can use retinol after a HydraFacial. However, starting slowly when incorporating retinol into your skincare routine is important, especially after a HydraFacial. This is because this facial treatment may leave your skin more sensitive than usual. Begin by using retinol once or twice a week and gradually increase frequency over time if your skin tolerates it well. Always consult with your skincare provider to determine the best approach for your unique skin concerns and needs.