A lump under the middle of chest may be keloid, lipoma and fibroma or rib tuberculosis. 1. Keloid: If the middle of the chest has been traumatized, or has undergone surgery, and you are a keloid, a dark red skin protrusion will form after the wound recovers, which is hard to the touch and may grow slowly in the later stages. 2. Lipoma and fibroma: under normal circumstances, subcutaneous lipoma and fibroma will be manifested as a localized elevated mass with smooth surface, accompanied by pressure and pain, and if not handled in time, it is easy to cause inflammatory masses. 3. Rib tuberculosis: there is no obvious symptom in the early stage, and some patients may have abscess without redness or heat, with obvious pain symptom and fluctuating sensation when pressed. If there is a lump in the middle of the chest, it is recommended that the patient consult a doctor in time to find out the cause of the disease, and then further treatment, so as not to delay the condition.