Pukering nipples

When you read directions for self breast exams they always tell you to look for 'nipple puckering'.  What is nipple puckering, what does it look like and what does it mean if you have it?  Thanks!

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Dear Synove:  Nipple puckering refers to a new instance where the nipple is not protruding as before but appears withdrawn into the breast tissue.  There are people who have inverted nipples - and this can be normal for them.  Primarily, self-breast examination indicates that a change in the appearance of the nipple may need further investigation.