I have had this many times with DD2 but never with DD1. Make sure you empty the breast completely at feeds and feed often. If you have to express the good breast and feed from the sore one, then do that although don't neglect the ok one too much or you will get a blockage there too. Massage the area before feeding and apply a heat pack, hot face clothe, or go into the shower and allow the warm water to run over the breast while massaging. Then feed afterwards and put a cold compress on after feeding. It is painfull to massage the area but you need to clear the blockage before it develops into mastitis. Of all my blockages, only one developed into mastitis when I couldn't clear the blockage. I started getting flu like pains and felt so run down and then had to have AB. So give it at least 48 hrs if you are not feeling fluish and just make sure you do everything to clear the blockage. Oh yes, I have tried putting a cabbage leaf on my breast while not feeding and it did help. The blockage cleared faster so try that too if you don't come right with the other methods. Phone the ABA as well. They have lots of advise. Good luck. I know it can be really painfull.