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(MAC) Microcystic adnexal carcinoma is a rare, malignant appendage tumor considered as a low-grade sweat gland carcinoma that normally occurs on the head and neck, mostly on the central face. Microcystic adnexal carcinoma shows aggressive local invasion but has little metastatic potential. Goldstein described the first series in 1982, emphasizing the importance of its distinction from the benign histologic mimics termed syringoma, desmoplastic trichoepithelioma, and trichoadenoma.