"Variegation"
nothing to worry about. Slight pigmentation defect that doesn't hurt your plant. In extreme cases, you'll see a leaf where half of it is pale yellow -- with a vein as the boundary. Looks cool at least. In this case you just have a couple blotches.
most of the time it grows out of it and you don't see it with later growth, but even if it continues it is not a problem on its own.