From the Mammography toolbar, click the Show
Skin Line button, 
.
The skin line detection tool outlines the breast skin line in mammography images. The skin line detection tool requires a mammography plug-in module license.
To show or hide the skin line of the selected image, do the following:
From the Mammography toolbar, click the Show
Skin Line button, .
When being calculated, an icon appears in the top left corner of the image frame indicating processing is incomplete. If skin line detection fails, the icon turns into a warning icon. Place the mouse over the warning icon to display the message indicating the skin line could not be calculated.