Hi Gena,
As I know unfortunately it is not possible..
If you are using older version of JIRA you can only see what was changed only if you have received a notification about the change. Then JIRA will show previous version of a comment.
In the new JIRA (>5.0) I do not see that functionality anymore... I am receiving only a notification that the comment was edited but JIRA is not highlighting words or phrases anymore.
Regards,
Mirek
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