Painful Pimple On Breast. This can manifest in different ways but the most common one is a white pimple which is normally a milk bleb or milk blister. Acne on the breast can occur at any time of life though it is most common during puberty and around menses in adult women and anywhere on the body with hair follicles 1.

Painful pimples may result from bruising or from your attempts to pop them. Dont worry they go away quickly. Mastitis is a painful inflammation of the breast and is more common in women who are breastfeeding.
These blisters might be painful and can cause tenderness in your breasts.
While it is nothing to be concerned about acne can scar if left untreated. Red spots on breast is sometimes a sign of breast infection that occurs within the breast tissue causing swelling lumps and pain. It is often red can cause fever and may cause the surrounding skin on breast to swell. Usually a boil is a swollen bump under the skin.