Dents on the breast epidermis can be caused by trauma or inflammation, nipple inversion, breast cancer, physiological factors and so on. 1. Trauma or inflammation: when the local skin of the breast is traumatized or inflammation occurs, it can cause local fat cell necrosis, resulting in dimples on the breast epidermis. 2. Nipple inversion: due to congenital factors such as short milk ducts, or breast tumors invading and pulling the ligaments, fascia, ducts and other tissues of the mammary glands, the nipple can be inverted, which can be observed in the epidermis of the breast such as concave spots. 3. Breast cancer: when breast cancer occurs, the cancer invades the skin and the suspensory ligament of the breast at the gland, which can lead to the contraction and pulling of the ligament, causing the inversion of the breast skin on the surface of the cancer, and the appearance can be manifested as a concave point of the breast. It is also called “dimple sign” in clinic. 4. Physiological factors: obese people or people with endocrine disorder can cause the enlargement of mammary glands and enlargement of hair follicles on the breast skin, which will lead to the appearance of dimples on the breast epidermis. When there are dimples on the breast epidermis, it is necessary to consult a doctor in time and take appropriate treatment under the guidance of a specialized doctor.