Everyone has moles on their bodies, and as they age, they increase. The vast majority of moles are benign lesions that live peacefully with us, but about two in 100,000 moles may become malignant, known as malignant melanoma. So what kind of moles may be the tiger that eats people? Here to teach you to know those “evil moles”. 1.Large and ugly moles Malignant melanoma is generally larger than 5cm in diameter, with irregular shape, fuzzy border and jagged shape. 2.Moles with dark color and elevated surface If a mole suddenly becomes darker and blacker, changes its shape and elevates its surface within a few months, you should suspect it is a malignant melanoma. 3.Moles that bleed and break down appear to bleed, itch, and have difficulty in healing after breaking down, etc. If you find any of these manifestations, please go to a regular hospital for consultation in time. Malignant melanoma is a malignant tumor originating from ectodermal neural crest melanocytes. 90% of the tumors originate from the skin, but can also occur in the eyes, oral mucosa and other tissues. It is more likely to occur on the soles of the feet, between the fingers (toes), under the nails, on the scalp and other areas susceptible to friction. Because of its high malignancy, malignant melanoma can easily metastasize to the lung, liver, brain and bone through lymphatic tracts and bloodstreams, endangering patients’ lives. Treatment is mainly surgical resection with chemotherapy, radiotherapy, biology and other individualized comprehensive treatment.