Definitely go to have the mamogram. I have also read that they have an ultrasound for the breasts that is better.
Anyway, I nursed my oldest until she was a year old and got pregnant a few months later and then nursed her sister until she was a year old. I noticed that even three or four months after I weaned my youngest that my breasts would still get the sensation that I had let down. Sometimes I would get a little bit of discharge and they tingled like mad....like they were itching on the inside.
I had a small spot that showed on my mamogram but then a followup showed no change so they said not to worry about it, but they never figured out what was going on. It quit after a few more months but it drove me mad.
Now I didn't have cracked nipples or scabs though. That worries me. Have you heard of a rare breast cancer that looks like a rash and feels hot? My sister-in-laws mother had that type, but they caught it early. I've read about it and I don't know if scabs are a symptom, but I do know it is rare and many doctors don't even think about it when trying to diagnose it. Try a google search about a rare breast cancer that starts as a rash and feels hot....I'm sure it will pop up.