The hard lump after minimally invasive breast surgery is not a new growth of tumor, it is a normal phenomenon. After minimally invasive surgery, a cavity will be left in the body, and autologous tissues such as fibers and blood vessels can proliferate in the cavity to fill the defect, thus forming a hard lump. Most patients have no obvious symptoms, but those with a more sensitive constitution may experience pain and other discomfort. Over time, as the tissue in the organism recovers, the hard mass may gradually soften and subsequently disappear on its own. A hard lump after minimally invasive surgery is a normal phenomenon of the body and patients need not be nervous.