Oooooh, OUCH!!! :'(
Definitely looks like you're over pumping. If you're first starting out don't do it so long, I did it for 8-16 hours a day from day one for 6 months and actually did more harm than good even though I wasn't over pumping, they actually lost tissue and got saggy until I took a two month break and started up again doing 1-2 hours a day. I can get away with more time than that now, but use less pressure. Also you might try getting away from the baby oil, some use it fine, but I know my breasts don't like it, they spot like that easily when I do. The best thing you can do is give them a good massage before you noogle with some cocoa butter lotion. I use Suave Cocoa Butter with Shea lotion, massage them for at least 5 minutes, then smear on extra and pump them up. The cocoa butter will soften the skin and moisturize it which is important for noogling to work properly. And the cocoa butter will help to prevent stretch marks. I also have a bottle of cocoa butter vitamin E oil that I sometimes massage them with, but I wash it off and use the lotion to pump them up. Give them a good break, at least until those spots clear up, then start again using the lotion, and make sure not to over pump, the best way to tell is to look in a mirror and see what shade they look. If you see red dots or purple color release pressure, pink to red is okay, but spotted like they are now or purple is too much pressure. You only have one pair of breasts to work with, be careful with them, or they may go on strike and give you the opposite results from what you're looking for.
Good luck, and I hope they're better soon!