In 80% of cases, melanoma occurs in a new location. However, you should pay attention not only to the size, but also to the shape, uniformity of color, symmetry, and clarity of borders. All moles on the body are more or less similar to each other, their pattern is familiar and familiar. If suddenly one of them begins to catch your eye or looks like an "ugly duckling" compared to others, it is worth contacting a doctor.