Flat, pink non-itchy and non-painful marks on breast that come and go randomly? For the past couple of weeks I ve been having these strange marks appear on my left breast. They appear suddenly, and go away within a few hours to a day. They don t hurt nor do they itch. They are small (like a 1/4 centimeter) flat, pink and are usually round and surrounded by tiny red veins. They appear one at a time. Could this be hormonal? I just got over my menstrual cycle about a week and a half ago and was experiencing some breast pain. I m starting to get worried that it s something more serious. Help!