Sometimes you accidentally generate entries in the bash history that you do not want to have there (e.g. commands with credentials).
Here's how to remove single entries.

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You can look at the bash history with the history command.
To see e.g. the last 5 entries, use history | tail -n 5:

>history | tail -n 5
 1994  my-secret-command
 1995  cd xyz-mnt/
 1996  ls
 1997  cd appliance/
 1998  cd ..

Each entry has a number. You can use that to delete it: history -d 1994. Note that as you delete entries, the numbers of the following entries will change.