Well, that is a tag.
But from that photo we know next to nothing about it.
Does your phone have NFC? If so can you try scanning that tag with an app like Taginfo?
If that doesn’t work I would guess that it is a Low Frequency RFID tag. You could make certain by purchasing a diagnostic card and holding it up to the reader, or using a Proxmark3 Easy to scan the tag.
Once we know what kind of tag it is it is much easier to make a suggestion. Then there is the question of do you want an implant, a wearable, or just another tag or card?