Growth and enlargement Tenderness and hypersensitivity Darkening of nipples and areolas (the skin around your nipples) due to hormones that affect the pigmentation of the skin Darkened veins along with your breasts (due to the increased blood supply to your breasts) Your breasts may start leaking a yellowish, thick substance known as colostrum Nipples stick out more, and the areolas and nipples will grow larger Small glands on the surface of the areolas called Montgomery’s tubercles may become raised bumps