I have a small pea-like lump 1 inch above my bellybutton that at times is very sore to the touch...(not all the time)..at times makes my stomach hurt intensely..(only relief came when evacuating my bowels).. pain returned soon afterwards(sitting on toilet trying to re-evacuate again=only relief)...lump still there..no pain lately.. just ulcer-like dull ache(as of late)..should I be worried?