Breast ductal carcinoma starts inside the milk ducts and is the most common type of breast cancer. Knowing how it usually shows up can help you spot it early and see a doctor sooner. The first sign most women notice is a painless, firm lump in the breast. It may feel like a hard knot with uneven edges, and it doesn’t move around easily. The lump can be anywhere, but it’s often toward the under-arm side. Sometimes the skin over the lump dimples, looking like an orange-peel texture, or the nipple turns inward or points a different direction. You might... Learn more