A lump of flesh protruding from the armpit may be related to the causes of paratesticular breast, soft fibroma and lipoma. 1. Associate breast: due to congenital developmental abnormality resulting in polydactyly, manifested by lump-like localized bulging, nipple-like bulge in the central part or areola-like pigmentation, which may be accompanied by pain. 2. Soft fibroid: mostly occurring in middle-aged and old people, manifested as wart-like, filiform, polyp-like swelling, soft and inelastic skin. 3. Lipoma: if there is normal fat tissue between the skin and muscle in the armpit, the phenomenon of a piece of meat protruding may appear. It is recommended to go to the hospital in time when there is a lump of flesh protruding from the armpit causing discomfort, to clarify the cause of the disease, and to carry out standardized treatment under the guidance of the doctor.