Jennifer, when adult gnats drink water from the new leaves,that is how it looks like... please look under the leaves. I bet you you have a night munching crowd under them. See, I have an upper shelf on my window, so I see those plants from below, that is how Ifound the idiots...and they are evil! the cutting is just reacting to loosing moist in those punching holes. Since I put tents on my leaves this spotting have stopped!