This may not be an infectious disease or a pest, but we’ll cover all the bases just to be sure. Examine the underside of the leaves that correspond to the black spots on the top of the leaves. If you see yellow/orange, white, or gray fuzz, or more black spots (you may need to look very closely) than you have one of several common fungal diseases. If the black spots begin to develop yellow rings around them on the top of the leaves, this is also a disease. If you see tiny little insects that are green or white you have a small infestation of a common insect. In either case, you can remove the affected leaves (it appears there are only two from your photo) and dispose of them. Then keep an eye out for further occurrances, and if you see more go to your local garden center with leaf samples sealed in a bag for advice. Otherwise, if you don’t see anything on the underside of the leaves now, its likely just a single event that caused the spotting, like sunlight reflected thru an automobile window, damage caused by handling, or the plant roots dried out for a short period causing a few cells to die; and of course in this case you don’t need to do anything except keep the soil moist until you plant it out in the garden.
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