I found a really small lump on my testicle a few months ago and went to the doctors to get it checked. He examined me and said he couldn't find anything and that it was probably nothing to worry about. I did have a dull ache around my abs/groin but I put this down to heavy lifting. This went away but I recently pulled my back out and have an aching but I can't locate if it is in my testicle or my hip. The lump seems to change size which leads me to think it is fluid filled but I have convinced myself that I have cancer. Can anyone help to put my mind at ease?