Nodule is a palpable round, round-like or oval shaped limited substantial damage, mostly located in the dermis or subcutaneous tissue, can be divided into benign and malignant. 1. Benign nodules: usually have a relatively intact periphery, tougher texture and smoother borders. For example, the most common benign breast nodule is benign fibroma. The most common benign breast nodule is benign fibrous tumor of the breast. This kind of benign nodule, after surgical excision, will have a complete envelope wrapped around the surface of the nodule. 2. Malignant nodules: In contrast to benign nodules, malignant nodules usually have unclear borders and irregular patterns, and grow invasively into the surrounding subcutaneous tissue. Malignant nodules grow rapidly and are rich in blood flow, which can be very damaging to the human body. For example, malignant breast nodules, also known as breast cancer, are typical malignant nodules. It is recommended that patients with malignant nodules should consult a doctor in time, and follow the doctor’s instructions to choose the correct and reasonable way of treatment according to the different benign and malignant nature of the nodules.