The cache of the page is cleared automatically after the comment is approved of.
You need to open the page which is /wp-admin/edit-comments.php and click on the approve link. Only the cache of the page is cleared.
Note: If the comments are approved automatically, the cache of the post is cleared as well.
Follow the link: http://www.wpfastestcache.com/tutorial/to-clear-cache-after-update/
We occasionally need to clear a page’s cache, but clearing the entire cache is not good for CPU. For this…
If a post or page is updated, the cache of post or page is cleared.
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