A bruise on the nipple combined with pain has to be checked by a doctor. It doesn’t sound serious, but only a physical examination (inspection and palpation) followed by an ultrasound examination and mammography can confirm or exclude some type of disorder of the breast(s). Further, every woman over 40 should perform a mammography once a year. To prevent possible tumors, cancer, or health problems a self-examination in front of the mirror should be performed once in a month.