Mucinous carcinoma is a rare malignant tumor with unique histopathological features. It shows that there are cell islands of different sizes floating in the mucus lake formed by a large number of mucins. Mucinous carcinoma can originate from a variety of epithelial tissues and can occur in multiple organs. The most common origins of mucinous carcinoma are skin appendages, breast and digestive tract, and other special mucinous cancers can originate from bladder, lung and so on. Primary mucocutaneous carcinoma is a rare malignant tumor of skin appendages, which mostly occurs in elderly male patients, mainly in scalp and eyelids, but also in other parts of the body. The clinical manifestations of this disease are usually slow-growing red plaques or tumors, with slow growth and relatively good prognosis.