Paget's disease

Japanese: Paget's disease（英語表記）Pagetsdisease

...This self-examination should be done each month immediately after your menstrual period ends.
[Paget's disease]
One particular form of breast cancer is Paget's disease, which originates in the milk ducts of the nipple and causes a sharply demarcated eczema-like change in the nipple that does not respond to eczema treatment.

From [Skin Cancer]

… In cases of multiple lesions, it is often due to chronic arsenic poisoning. Paget's disease is intraepidermal metastasis of breast cancer or apocrine gland cancer, and is seen in the areola, vulva, and perianal area. At first glance, it appears as a sharply demarcated erythema reminiscent of eczema or sclerosing rash, with scales and crusts, and some areas may become eroded. …

*Some of the terminology that mentions "Paget's disease" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…この自己検診法は，毎月月経が終わった直後に行うのがよい。
［パジェット病］
　特殊な形の乳癌の一つにパジェット病(ページェット病)Paget’s diseaseがある。これは乳頭部の乳管から起こる癌で，乳頭に境界鮮明な湿疹様の変化をきたすが，湿疹の治療には反応しない。…