Concurrent extramammary Paget's disease involving the genitalia and axilla: Case report and literature review.

Concurrent multiple primary extramammary Paget's disease (EMPD) is rare. Herein, we present two Chinese cases of concurrent primary EMPD involving both the genitalia and the axilla, and they also had a history of other malignancy. We also summarise the cases of multiple primary EMPD previously described in literature. Careful examination of all apocrine sweat gland-bearing sites and additional internal malignancies is recommended for patients with EMPD.