M.S.
I'm no expert, as I wasn't able to BF myself, but I did do a lot of research on it before I had my daughter. Sounds like you still have a plugged duct, which can sometimes lead to mastitis, so it's good to go ahead and try to get it unclogged. Here's a good site with some things you can do to help the milk move again:
http://www.drjaygordon.com/development/bf/mastitis.asp
Also:
Blocked ducts will almost always resolve spontaneously within 24 to 48 hours after onset, even without any treatment at all. During the time the block is present, the baby may be fussy when nursing on that side, as milk flow may be slower than usual, probably due to pressure causing collapse of other ducts. Blocked ducts can be made to resolve more quickly by:
* Continuing breastfeeding on the affected side.
* Draining the affected area better. One way of doing this is to position the baby so his chin “points” to the area of hardness. Thus if the blocked duct is in the outside, lower area of your breast (about 4 o’clock), the football hold would be best. Another way of achieving better draining of the breast is using breast compression while the baby is feeding, getting your hand around the blocked duct and using steady pressure as the baby sucks.
* Applying heat to the affected area (with a heating pad or hot water bottle, but be careful not to injure your skin by using too much heat for too long a period of time).
Good luck!