I've been breastfeeding my baby since birth for about 3 weeks now and noticed some lumps on my breasts since the beginning. They are not painful unless I press on it or squeeze it, which I try to do whilst breastfeeding but it does not seem to make them go away. They are also not red and not noticeable visably. Are these blocked milk ducts? If not, do I need to do anything about them? (if they are blocked milk ducts, I've read on other threads what needs to be done to clear them). Also, I also got a white blister (like an acne with pus inside) on one of my nipple which is painful to be touched. I read from the other thread that it needs to be pierced with a sterilised needle preferably by a doctor or lactation consultant to reduce the risk of infection. If there are any other way of removing it, please let me know. What causes these blisters and how can they be prevented? Any advice appreciated!