Everyone has moles of all sizes on their bodies, and if it is not an eyesore, you can actually leave it alone. However, if it suddenly becomes bigger, deeper in color than before, bulges on the surface, itches or hurts, breaks down and bleeds easily, then you have to be careful, as these may be signals of cancer! Everyone has moles of various sizes, and only a small portion of them are cancerous. If the following situations occur, you should pay attention to 1, the mole suddenly becomes bigger recently, the color deepens obviously compared with before, the surface rises and itching or pain occurs, and it is easy to break and bleed; 2, the pigment on the surface of the mole is unevenly distributed, and there is an irregular halo of pigment around it or the pigment is diminished; 3, there is a small black spot or a satellite-like damage on the skin around the mole, etc. You should go to the hospital as soon as possible to find the above abnormalities. If you find any of the above abnormalities, you should rush to the dermatology department of the hospital to remove the suspicious mole and do pathological examination to confirm whether it is cancerous or not. In addition, the moles in the following cases, no matter whether there are changes or not, it is best to go to the hospital as soon as possible to remove them in order to prevent cancerous changes 1, moles that grow in the parts that are often subjected to friction (such as the place where the beard grows, the perineum, and the place where the bra is worn, etc.); 2, moles that grow in some special parts, such as the feet, the palms of the hands, and moles that are under the fingernails; 3, moles with a diameter larger than 5 millimeters; and 4, moles that are infected over and over again. Former U.S. President George W. Bush Jr. once knocked out a few spots on his face just to prevent the pigmented mole from becoming malignant. Of course, a mole that suddenly turns black or gets bigger is not absolutely an indication of cancer, especially when this change occurs during pregnancy, there is no need to panic, because at this time the color of the mole will be darker than before, and there is a tendency to increase in size. However, it is important to keep an eye out for it and it is best to consult a doctor at a dermatologist.