The most common cause of a hard lump between the two breasts is a subcutaneous lipoma, fibroma, or sebaceous cyst. This condition results in a subcutaneous lump with a hard texture and good mobility, with some individual patients experiencing pressure pain. In case of infection, redness, swelling, heat, pain and even suppuration may occur. Therefore, when there is a hard lump in the middle of the breast, you must not squeeze it and go to a regular hospital for an ultrasound examination. Through the ultrasound, it can be determined whether the lump under the skin is an inflammatory mass or some disease such as lipoma. If the lump or hard lump is large and caused by inflammation, anti-inflammatory and symptomatic treatment can be given. If it is a sebaceous cyst, fibroid or lipoma it can be removed surgically and treated symptomatically after surgery. This will clarify the diagnosis and allow the disease to be completely cured.