where can transmission fluid be leaking from

What is your question?

I stopped using car about four months ago .my wife used it everyday for work before that .its been sitting in driveway and I have noticed a oil stain on concrete and continues to get larger and larger. pu a tray underneath to see if I can determine what color it is. I believe its tranny fluid. does it mean its the tranny seal or sometimes I here they can leak from a modulator. it didn't leak when used every day but sitting there it seems to leak more each day. any suggestions are appreciated