Is this of any concern?

I did some searching and could not figure out what this is. What are the dark spots/blotches and do I need to be concerned?

Is it just this one leaf or all over the plant? If just one leaf it could be from being wet and lying on something, If it's all over the plant yeah it's a concern

It's not on the whole plant, I know that for sure. However, I don't know how many affected leaves there are. I will have to take a look tomorrow and see if there are any more like it and if so, how many.