Hi, Bruises on the breast can occur due to a variety of reasons, including trauma, injury, or even a medical condition. It is possible that your girlfriend s bruises were caused by a fall, especially if she remembers hitting her breast during the fall. However, without a physical examination and more information about the circumstances surrounding the fall, it is difficult to determine the exact cause. It s important to keep in mind that bruising can also be a sign of a more serious underlying condition, such as a blood clotting disorder or breast cancer. If your girlfriend s bruises are severe or accompanied by other symptoms such as pain or swelling, it is important to have her evaluated by a healthcare provider as soon as possible. In any case, it s important to approach the situation with empathy and concern for your girlfriend s wellbeing. You can offer to help her schedule an appointment with her healthcare provider or provide support during the evaluation process. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Priyanka, General & Family Physician