bigdog

It's a leaf spot disease, caused by a fungus. It's not going to kill your plant, but it will not be aesthetically pleasing. I would recommend spraying with a copper fungicide, or other fungicide indicated for leaf spot disease. Sadly, the only way to get rid of it...is to defoliate your plant and destroy the affected leaves. You can try spraying the soil as well, or just repot into some fresh soil, making sure to wash all of the old soil away completely before repotting (that's what I would do). Try to keep the plant just a bit on the dry side if you are growing it inside. This fungus likes cool, wet conditions to thrive. Giving it the exact opposite conditions will hurt it. I would completely defoliate it though, especially since you only have a few leaves to begin with. You could wash the leaves off with a paper towel and a 10% bleach solution, and then spray the fungicide, and that may help to kill the spores. They hide in the middle of the black spots. If you get down there with a good magnifying glass, you can see them.