What might be the issue here?

[Boom_Mindstorm]

Is this from some sort of bug? I checked the underside of the leaves on all 3 of my plants and only saw one small yellowish green bug. All help is greatly appreciated!

 

[Creeperpark]

I don't think that is a bug problem it looks more like a water spot from using tap water. Post a photo of the whole plant in the container.