Hi, I'm really prone to plugged ducts and blebs. A few months ago a lactation consultant recommended a few things that have really helped:
-taking lecithin 2-3 times a day. I used to get plugged ducts once a week or so, since taking it I've stopped getting plugged ducts. I had 2 blebs on 1 nipple at the time. I'm currently down to one that would go away and come back. It's just really stubborn, also it's been so long now that I've stopped doing all the other things the lactation consultant recommended.
-taking hot baths several times a day for at least 20 min and ideally right before nursing. I didn't have the time to do this, so I aimed for one bath a day. or, a hot shower helps too.
-if you don't have time for the above, soak the nipple in a bowl of hot water right before nursing/hot compresses. I found a wetting a diaper and microwaving it for 45-60 sec a convenient alternative to soaking in a bowl.
-after nursing, put on aquaphor. she says it works better than lanolin, but you can't just leave it on like lanolin. you have to rinse it off before nursing.
hope this helps!