You will see veins and other blood vessels as dark lines in your breast. These are totally normal.
Over a number of months you will learn what your breasts look like when lit by your Breastlight. This internal view will become as familiar to you as the look and feel of your breasts on the outside.
As with all the aspects of breast awareness the important thing is to look out for any changes
But it is for a seriouw reason....
PS from the training I got if you relly to CPR instruction on teh very critical moment you are busted