It is possible that the hard lump in the armpit will be eliminated by itself, the specific situation should also be decided according to the cause of the disease, and can not be generalized. 1. Underarm lumps will be eliminated on their own: if the inflammatory lumps are caused by infection of the soft tissues of the skin or hair follicles in the armpits, or lymphadenitis, they may be eliminated on their own after the inflammation recovers. However, in order to ensure the elimination, it should be treated under the guidance of a doctor. 2. Underarm lumps will not be eliminated by themselves: if the underarm malignant tumor lymphatic metastasis or lymphoma, generally will not be eliminated by themselves, in addition, sebaceous cysts, fibroid tumors, or lipomas caused by underarm lumps, will not be eliminated by themselves. These cases need to be treated under the guidance of a doctor. If you have hard lumps in your armpits, you should go to the hospital in time for examination, clarify the cause of the disease and follow the doctor’s instructions for treatment.