A bulging mole may become cancerous, but the chance is relatively small. Because moles are generally benign, but frequent squeezing and stimulation or frequent touching may cause the surface of the mole to be broken and cannot heal for a long period of time, which may lead to abnormal proliferation of the mole and thus cancer. If there is no obvious increase in the size of the mole, it can be observed without special treatment; if the mole becomes bigger rapidly in a short period of time, it is necessary to pay attention to it, and it is recommended to have it removed, and the diagnosis can be clarified through pathologic examination. If the mole becomes malignant melanoma, the degree of malignancy is still very high, and it is especially easy to metastasize all over the body, even if the primary lesion is removed, it may still spread, thus endangering the life.