What is the fine-grained topic of the following text: The DESCRIBE® PFD Patches are FDA cleared, small squares of silicone infused with PFD (Perfluorodecalin) – a completely inert, harmless liquid that allows practitioners to treat a tattoo several times with the laser in a single treatment session. Only return the topic.
FDA-cleared DESCRIBE® PFD Patches for laser tattoo treatment sessions