A benign breast nodule will not go away if it is a true nodule, because nodules are found on ultrasound. A nodule that can be found on ultrasound refers to an abnormality in the echogenicity of the local breast gland, and this echogenicity does not necessarily mean that there is a true local mass. Of course, if there are structural changes on ultrasound larger than 5 mm, that is, shadows, they are almost always true nodules. If the nodule is particularly small, 2-3 mm, it may not be a true mass and may disappear on the next review, but it is unlikely to disappear if it is larger than 5 mm. Once a nodule is created, it is a local structural abnormality, so it is impossible to reverse and disappear. Once a nodule appears, it should be treated by follow-up and surgery according to the nodule classification on ultrasound.