Really strange question here but has anyone ever checked for lumps and found exactly the opposite - a hole? I have a dip in the skin at the top of my breast. When you run your finger over it, it feels like a hole that goes into the breast tissue. Should I be concerned? I noticed it about a year ago. It doesn't hurt and it isn't noticeable just by looking. I don't know how long it's been there!
crete and nanny dawn are right, you should see your doctor, however I have exactly the same thing. I first noticed it about 10 years ago and checks revealed it is just a small dip in the muscle. Mammograms that I have had since are all clear so I'm sure you are OK too.