Mucinous carcinoma can occur in non-cutaneous visceral sites and may metastasize to the skin. Thus it is important to exclude the possibility of a non-cutaneous visceral primary tumor before diagnosing primary mucinous carcinoma of the skin (PMCS). We describe a PMCS with unusual histopathological 6ndings. Although the microscopical, immunohistochemical, and ultrastructural characteristics of PMCS have been well defined, only less than sixty cases have been published since the disease was first reported by Lennox. This is an unusual case where combined features of apocrine carcinoma and predominant cribriform patterns reminiscent of adenoid cystic carcinoma exist in part, with highly anaplastic cellular features and frequent mitosis. To our knowledge, there have been no reports of this rare neoplasm in Korea. (Ann Dermatol 10(4) 266-269, 1998).