Breast nodules with clear boundaries and irregular shapes are considered to be breast diseases, which need to be dealt with after clarifying the benign or malignant nature of the nodules and following the doctor’s instructions. 1. Benign nodules: If benign nodules are detected by breast ultrasound or chest CT scanning, they are generally not harmful to human health, and often show clear boundaries and regular shape of breast nodules, slow growth of nodules, elastic texture, smooth surface, and can be treated conservatively or surgically according to the specific conditions of the nodules. 2. Malignant nodule: it usually shows unclear boundary of breast nodule, irregular shape, hard texture, with the increase of nodule, local pain, nipple overflow and other symptoms. In this case, surgical excision and other treatments are needed. It is recommended to consult a doctor in time after the discovery of breast nodules with clear boundaries and irregular shape, and standardize the treatment under the doctor’s guidance.