For the past couple of months I've noticed a small lump (about 1/2 inch diameter) on the upper left quadrent of my body ( apprx. 2in above and left of belly button). I feel no pain or discomfort but sometimes especially when I think about it or press on it, I feel a slight heaviness around this area. I am a 49 years old male with a clean history concerning health problems and no surgeries of any kind. I am overweight (6'11" - 110kg) and for the past year I have been going through very high levels of work/financial related stress. What would you think the cause of this lump be? (Splean, pangreas, etc. related?) What tests would I need to perform in order to detect any possible problems and what kind could they be?