Named for Sir James Paget, an English surgeon who first described this condition in 1874, this condition is also known as Paget's disease of the nipple. Paget's disease is present in 2% of all breast cancers. It results from an intraepithelial spread of malignant cells from an underlying intraductal carcinoma of the breast.
Outwardly may have the appearance of eczema-like skin changes involving the nipple. Usually only affecting one nipple, there may be redness, oozing and crusting and a sore that does not heal.
Tests necessary are a mammogram and a biopsy to confirm the diagnosis.
Treatment usually involves some kind of mastectomy to surgically remove the tumour. Chemotherapy and/or radiotherapy may be necessary.
Have a gander at the different Paget's Diseases.