Alicia, there's a possibility this could be inflammatory breast cancer, but it would be more usual for there to be a progression of symptoms in the timeframe you mention; cancer doesn't usually stand still. Also, the likelihood would be you'd have more soreness/redness. The ultrasound must have ruled out a cyst or cysts; so I'm wondering why your doctor didn't just go ahead with the next logical step, which would be a mammogram. You might want to ask him/her why that test wasn't ordered. I'd assume the breast specialist will use a mammogram to help diagnose what's going on, but you still might want to question your doctor about it.
We're not doctors here, and can't diagnose medical issues; we're here to offer support and advice as you go through diagnosis and treatment. Hopefully the breast specialist will be able to determine what's causing this swelling/pain, and find a way to deal with it. Best of luck to you - PJH
Alicia, you've ruled out many of the reasons for a swollen breast, so the main two ones left that I am familiar with would be an infection and cancer, especially inflammatory breast cancer. Although a fever often accompanies an infection, I'm a bit surprised that your doctor didn't order an antibiotic to rule out infection.
It's great that you will be seeing a breast specialist. I'm wondering if there is a way to either move up your appointment or to schedule some of the methods that the specialist might want to use in diagnosing you between now and then. Some of these might include: an antibiotic to see if there is an infection of some sort, a mammogram, or an MRI. While it is true that mammograms are not as useful in younger women, I would think that they would want a baseline mammogram done to check for future changes.
There could also be something hormonal going on. Usually breasts are most swollen before a period, but if your hormones are out of adjustment, perhaps they are affecting your breast. There could be a benign lump deep on the chest wall where it can't be felt distorting the shape of your breast.
As PJ points out, we are not doctors here, so there are probably plenty of other possibilities that we don't know about. It is too soon to panic about this being a rare form of cancer since you don't have all of the symptoms of IBC. However, it is good that your doctors have taking this seriously and have referred you for further evaluation. Let us know what you find out. I wish you the best.
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