You can have a maximum of twenty five app specific passwords at once and if you need to revoke these app specific passwords you can revoke all at once or individually one by one. Below are the steps to revoke app specific password.
Step 1: first you have to sign in to the Apple ID account page.
Step 2: click on Edit in the security section.
Step 3: click on view history in the app specific password section.
Step 4: click on the cross symbol near the app specific password you are going to delete or you can revoke all.
After revoking a password you will be signed out from the apps that you are using that account until you create another password and sign in. Anytime you reset or change your Primary Apple ID password, all your app specific passwords will be revoked automatically to secure your account. It will be needed to create a new App specific password to continue using those apps.