A hard lump inside the calf that is painful to press may be related to trauma, subcutaneous swelling, phlebitis, and tumors. After trauma will cause muscle bleeding, if the bleeding is large and can not be completely absorbed, it will form hematoma hard lump, when pressed there will be painful symptoms. Subcutaneous swelling in the calf, such as lipoma, fibroma, sebaceous cysts, etc., if the swelling is large and compresses the surrounding tissues, there will also be pain when pressing the symptoms. If superficial phlebitis is present in the calf, a tortuous mass of veins may appear, which may also be painful on pressure. If there is a hard lump in the calf with pain that continues to worsen, it may be a benign tumor, such as an osteochondroma, but you also need to be alert to the risk of malignant tumors, such as osteosarcoma, which is a large tumor that can be palpated when it breaks through the bone cortex. If there is a lump inside the calf with pressure pain, it is recommended to go to the hospital for medical examination, to clarify the cause of the disease, and then follow the doctor’s instructions for targeted treatment, so as not to delay the condition.