I had my appointment today with my doctor. There's definitely something going on in there. She thinks it might be a cyst or mastitis. She sent me home with a prescription for antibiotics, and I have an appointment for Tuesday afternoon for a mammogram and an ultrasound if necessary. Her office should get the results within 24 hours, so hopefully I'll have some answers Wednesday afternoon. In the meantime, if it's an infection the antibiotic should have it on the mend.