Endocrine mucin-producing sweat gland carcinoma (EMPSGC) is thought to be a precursor to mucinous carcinoma, both of which are rare. In this case report, the authors present a 55-year-old woman with concurrent EMPSGC and mucinous carcinoma manifesting with 2 distinct lesions on her left upper and lower eyelid and 1 lesion on her right lower eyelid. Biopsy and immunohistochemical staining supported primary cutaneous origin of the tumors. Systemic metastatic workup was initiated and thus far negative. The patient underwent staged slow Mohs micrographic surgery to remove one tumor at a time, with delayed reconstruction. This is the first reported case of EMPSGC and mucinous carcinoma presenting as distinct lesions both bilaterally and synchronously.

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