I'm a new user so I don't have a lot of technical knowledge yet, would appreciate some help on this. I'm seeing these splotches and spots on the photos in my DSLR camera.

I'm stumped on the source of the big ugly splotch in the centre and its 2 siblings to the left. I've cleaned both ends of the lens; unfortunately, I only have the one lens so I can't swap it out to see if the splotches remain. Position of splotches is constant in all photos.

Thanks in advance for the assist! Camera is the Nikon D7200, lens is 18-105mm.