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Mucinous carcinoma is a type of cancer that arises from epithelial cells; these line certain internal organs and skin, and produce mucin (the main component of mucus).
When found within the skin, mucinous carcinoma is commonly a round, elevated, reddish, and sometimes ulcerated mass, usually located on the head and neck.
References
Mucinous carcinoma Wikipedia(Text) CC BY-SA