Breast cancer is most commonly found (60% of cases) on the outer boundary of the breast. Its symptoms often include a single, painless, small lump that is hard, with an uneven surface and an irregular shape. The boundaries of the lump are not clearly distinguishable from the surrounding tissue, and it cannot be easily moved within the breast. The skin over the lump may show signs of redness, swelling, dimpling or orange-peel-like changes. Additional symptoms might include dimpling, ulceration, and other abnormalities. The lump may be associated with changes in the same side nipple, such as bloody discharge, and enlarged lymph nodes can sometimes be felt under the armpit.