https://www.survivingbreastcancer.org/post/self-breast-exam
While self breast exams are not a formal screening modality, there is great value in being familiar with the look and feel of your own breasts so you understand what is normal to you and are able to detect and promptly report changes.
While we are proponents of breast self exams and knowing your body, it is important to know that BSEs should never take the place of breast cancer screenings.