Blocked ducts usually mean that the milk is not moving well in a part of your breast. Then the milk backs up, causing lumpiness and discomfort. If you don't get the milk flowing, it can lead to inflammation.
The inflammation happens when milk backs up and is forced out of the duct into the surrounding tissues. Traces of milk may enter your bloodstream and your immune system responds, making you feel feverish and as if you have flu.
What to do:
Remove any white spots (blebs) by rubbing them gently with a clean, warm, damp flannel or using a sterile needle, after you've had a bath or shower. Your baby may even remove the bleb herself while feeding. As long as you deal with these spots, and check for them from time to time, they should be nothing more than a nuisance.
Keep breastfeeding your baby from your affected breast, if you can, even if it’s uncomfortable. It will help you to get better faster, as your baby will empty your breast.
Feed as often as possible, starting with your affected breast, and make sure there aren’t long gaps between feeds. This may sometimes mean waking your baby for a feed.
Make sure that your baby is latched on well. A breastfeeding specialist will be able to help your baby to latch on properly. Your midwife, doctor or health visitor should be able to put you in touch with one.