The condition can affect your breasts in different ways. Some breast cancer symptoms are very distinctive. Others may simply seem like areas of your breast that look very different from any other area. Breast cancer may not cause noticeable symptoms either. But when it does, symptoms may include: A change in the size, shape or contour of your breast. A mass or lump, which may feel as small as a pea. A lump or thickening in or near your breast or in your underarm that persists through your menstrual cycle. A change in the look or feel of your skin on your breast or nipple. Your skin may look dimpled, puckered, scaly or inflamed. It may look red, purple or darker than other parts of your breast. A marble-like hardened area under your skin. A blood-stained or clear fluid discharge from your nipple.