Newborn with lump in breast

Hi everyone, we've been seeing doctors about this, but hopefully someone can come up with new ideas on this as the doctors say its an uncommon case.

My then 2 1/2 weeks old daughter, good weight/height and gaining continuously, no fever ever, developed a lump, about as big as a quarter, under her breast/nipple. She bled a very small amount from her nipple about 3 days before, we got a bit worried but read its pretty common and it didn't bleed the next day. When we noticed the lump, we took her to her doctor, who, as we thought, said its probably an infection and gave her Cephalexin. We went back to 48 and 72 hour visits, the lump hadn't changed at all. The doctors consulted a pediatrician infectious specialist, who advised to take an ultrasound if no changes by the 5th day.

The ultrasound showed a solid mass of tissue, with no blood vessels in it, but with blood vessels around it. No pus or anything that can be drained. That day the 3 doctors switched us to augumentin. They're not 100% sure its an infection, but it still looked as the most likely option, and we hoped that the augumentin would shrink it. We have another appt scheduled for Friday.

However, in the last 2 days, the previously unchanged lump started getting more red and purple maybe, looking much angrier. Still no fever. We plan to call the doctors and go in sooner then Friday.

Other things the doctors said, that its not mrsa since no fever, the blood work showed normal levels of inflammation, which means that either the antibiotics work or that its not an infection. Surgical removal becomes one of the options if the augumentin doesn't work, but I am not sure what other options there are, either they're not sure or its bad enough that they don't want to mention those.

Anyway, the doctors seem just as puzzled as we are by this, its not progressing as it should for an infection, and I would really like to hear some ideas/opinions/anything. Thanks!! (http://imgur.com/a/SO6lr) http://imgur.com/a/SO6lr