"Many patients will wonder: 'I have a lump on my arm or my leg. Should I have this evaluated? Who should I see, and when are these symptoms concerning?'" says Dr. Krista Goulding, a Mayo Clinic ...

Cysts and fatty growth can also form lumps under the arm. Axillary is the medical term for the armpit area. This article explores causes, symptoms, diagnosis, and treatment for armpit lumps.