Help with young plant

plant has small i would say like a half or less than a dime sized mark on the leaf. The mark is in the middle of the leaf by the veins. No other leafs have it. No bugs in the area. the plant is 3 weeks old. what do you all think thanks sry no pic.
 
1134calcium-1.jpg
it is similar to this but only one spot not spreed out like this and it is is the middle of the leaf just one spot though thanks
1134calcium-1.jpg
1134calcium-1.jpg
 
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