Hello, It is difficult to provide a specific diagnosis without a physical examination and medical history, but based on your description, it is possible that you are experiencing a condition called hidradenitis suppurativa. Hidradenitis suppurativa is a chronic skin condition that affects areas of the body with apocrine glands, such as the breasts, groin, and armpits. It is characterized by the formation of small, painful, pimple-like bumps that can progress to become larger, deeper abscesses or nodules. These lesions can often break open, leading to the formation of open wounds or sores. When they heal, they can leave behind scars or hyperpigmentation. Other possible causes of pimple-like spots on the breast include acne, folliculitis (an infection of hair follicles), or it could also be due to an allergic reaction to a skin product or any material that comes in contact with one s skin. Get yourself evaluated. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. H. Kay, General & Family Physician