Thank you for your question-- I am sorry that your friend is going through this right now. IBC or Inflammatory Breast Cancer is a rare type of breast cancer that develops rapidly, making the affected breast red, swollen and tender.
Rapid change in the appearance of one breast, over the course of days or weeks
Thickness, heaviness or visible enlargement of one breast
Discoloration, giving the breast a red, purple, pink or bruised appearance
Unusual warmth of the affected breast
Dimpling or ridges on the skin of the affected breast, similar to an orange peel
Tenderness, pain or aching
Enlarged lymph nodes under the arm, above the collarbone or below the collarbone
Flattening or turning inward of the nipple
Inflammatory breast cancer doesn't commonly form a lump, as occurs with other forms of breast cancer.
Treatment for inflammatory breast cancer often begins with chemotherapy, followed by surgery and radiation therapy. After these treatments, additional treatments may be used to reduce the risk that inflammatory breast cancer will return.
Here are some sources of information on IBC, I think you will find them helpful:
Best wishes to you and your friend,