D.B.
That's not the sort of nipple discharge that is connected to breast cancer. In fact, most nipple discharge is not an indicator of cancerous cells - it's one possible indicator but this doesn't sound like that at all.
But these are sebaceous glands similar to sweat glands and the pores on your face and scalp that secrete oils. I'm not sure why yours continues to clog up and then only emit fluid when you press it, but maybe it's just leftover from the breast feeding days. These glands do have a purpose beyond that though. I believe these glands do respond to stimulation. So I'd say to leave it alone unless it's uncomfortable for you and you feel the need to relieve the engorgement. If you saw your doctor a year ago, you're probably due for another appointment in the next few months. So, I guess I'd consider some warm compresses in the short run to see if that opens up the opening a little to let the gland drain naturally, but I'd absolutely do nothing for at least 6 weeks before the doctor's appointment so that she can squeeze it at the time (as she no doubt squeezes the main part of the nipple during a routine breast exam). I definitely wouldn't stress about it unless you're going to do something about it, like make an appointment and let the doctor see you as you naturally are.
