If the patent application does not indicate that it needs to be corrected, can it be corrected by itself?

It can be amended together with the required amendment, and at the same time, the location and content of the amendment are written on the amendment. There are many revisions. If you have your own opinions to express, but you can't express them in the revised version, you can download the opinion statement for personal revision, so that the examiner can better understand your intention or purpose of revision and increase the chances of authorization (you can even ask the examiner to speed up the review).