There is no such thing as breast indentation, the problem should be breast surface indentation, which is manifested as skin depressions on the surface of the breast like “dimples”. The “dimple sign” is the result of tumor tissue invading the suspensory ligament of the breast, making it impossible to maintain the normal anatomical shape of the breast and resulting in a “dimple” appearance of the skin on the surface of the breast. The “dimple sign” is most common in malignant breast tumors, due to the malignant invasiveness of the tumor, when the tumor is large and pulls the Cooper’s ligament, it will show the skin depression state. If you find the “dimple sign”, you should consult a doctor in time, have a breast ultrasound and molybdenum target examination, and then follow the doctor’s advice to have the appropriate treatment if you are diagnosed with breast cancer.