Select Bad Faces from the dropdown menu of the Detect
tool in the Indentify group of the
Prepare tab.
Click Find matching bad faces
to search for and highlight faces with corrupt rendering. Those faces are highlighted
with a red circle.
Alternatively, in the options panel, you can select
Automatically find matches, however, it may take a little longer
to search and display the results on large models.
Select the red highlighted face and choose to convert it to a named selection or a primary selection .
or a primary selection 
.