EandN, it's not unusual to see the changes to your undeveloped man-breasts and want to be reassured that all is going well. The dimple is not a milk duct, just a feature of your particular nipple contour. The other may turn out that way, too. Nipples come in all shapes and sizes. Some are even inverted, leaving a small 'crater' in the center of the areola in the unengorged state.There are several milk ducts that open out at the nipple, not just one, and they are practically invisible in a non-lactating breast.
You're cool, dear!
Clara