The dimple sign is a characteristic manifestation of breast malignancy due to the progressive growth of a tumor that involves the suspensory ligament of the breast, also known as the Cooper’s ligament, which is a bundle of connective tissue located between the lobes of the gland and the skin. The patient will present with a dimpling of the breast skin on the surface of the lesion, also known as the dimple sign. Patients with malignant tumors of the breast may also exhibit nipple inversion due to the involvement of the milk ducts, as well as subcutaneous lymphatic obstruction, which is characterized by cellulite-like changes in the breast skin. Patients with breast malignant tumors should actively choose surgical treatment after early diagnosis, because lymphatic metastasis and metastasis to distant organs may occur in the development of the tumor. In severe cases, there will be invasion and fixation of the chest wall, especially in patients with inflammatory breast cancer, which will also show obvious congestion, edema and inflammatory changes in the whole breast, accompanied by obvious lumps.