question: yesterday the lower part of my stomach on the left side started hurting , and almost felt like a burning pain . i didnt think much of it . my stomach has been hurting on and off for about 5 days . i am over weight . bit i just noticed a very large bruise there on my lower left side of stomach . it is purple , blue and black .i do not recall bumping into anything . what could this be , should i got to the doctor or wait a day or two to maybe see if it goes away ?