The macaroons.db and individual macaroons can be found in your LND data folder. Delete them all, then restart the node.
Alternatively, you can run the following to invalidate all previously created macaroons:
lncli changepassword --new_mac_root_key
If auditing, list all macaroons with:
lncli listmacaroonids
Docs here also helpful: https://docs.lightning.engineering/lightning-network-tools/lnd/macaroons
