question: Hello, I am a 37 year old male and I have found a lump on the inside of my upper arm between my elbow and armpit.  It is not tender to touch it.  I have also been feeling extremely tired lately, but this could be due to me being a diabetic.  I had blood work done recently and everything was fine except my A1C was elevated and my proteins and potassium were slightly elevated.  Could any of this be related to the lump in my arm?  What could the lump in my arm be? Thank you!