Generally speaking, cysts are not cancerous. Cysts are a common benign disease with very little chance of malignant transformation. A cyst is a lump that grows on a part of the body with an intact membrane on the outside and usually fluid-like material inside the membrane, and is usually a benign mass. When the cyst is small, it usually does not have any symptoms and does not need special treatment; when the cyst is large or growing faster, it will show symptoms such as local pain and even infection, but it is not cancerous and only needs surgical treatment such as excision; while the lump formed by cancer is because of ischemic necrosis in its middle, these necrotic tissues are liquefied and wrapped, or some cancer cells with secretion function gradually grow In contrast, the lump formed by cancer is due to ischemic necrosis in its middle, which is liquefied and encapsulated, or the gradual growth of some cancer cells with secretory function, thus forming a cystic structure, which is a malignant lesion. The two are different in nature, so there is no need to worry too much about cysts becoming cancerous. When cysts appear, regular ultrasound and other examinations should be performed to understand the development of cysts so that effective treatment can be carried out.