Looks like some one has been at it with the vanish!
Rinse the area with normal cold water first. Then try some acid at 8:1 dwell for a while (10mins) and rinse. Then try some citrus gel the same way and rinse. Then try some pog then rinse, and if any thing is left after all this chemspec dyegone, or some sod met and a heat transfer method. Do not rub the carpet at any point! If necessary leave to dry off for a while before continuing. Don' t be afraid to leave it and admit defeat as a bigger light spot with distorted pile may look a lot worse. The stain may never come out.
I would highly recommend getting on a spot and stain removal course asap. It will pay for itself a thousand times over and your custys will think you are a cleaning god with some of the techniques you will learn. I think the cleansmart course is good as Derek Bolton is not afraid to tell you different methods you may not learn else where.
Rob