brown spotting

i have some brown spotting on 1 or 2 leaves at the very bttm.....is this early signs of something or natural decay?....also remember that it is the oldest groth on the plant and its ready to flower [video=youtube;zOeeGsOXnvc]http://www.youtube.com/watch?v=zOeeGsOXnvc[/video]

Pictures are helpful. But information on the conditions this plant are under, is just as important. Many problems have the same looks. Also a clear photo of the leaf and one of the whole plant would help as well.
Some of the information needed. Grow system type, medium, Nutrients and amounts, temps, humidity, age of plant, type of water used. The more information you give the better.