After gynecomastia surgery, it is common for the chest area to feel hard. This is usually a normal part of the healing process. Scar tissue and swelling are typically the causes of this stiffness or hardness. Your body reacts to the process by making the area swollen, which can make it feel hard or lumpy. This firmness generally goes away over time, usually in the months after surgery, as the swelling goes down and the scar tissue softens and changes. But if the hardness lasts for a long time or is accompanied by pain, redness, or an increase in swelling, it's important to talk to your surgeon or a medical professional to rule out problems like hematoma or seroma.