I'm guessing it's on the sensor as well.
OP, if you want to make sure try this.
Take a picture of some uniformly colored, well lit surface. The sky works well as does a blank word document on you screen.
Take the image as out of focus as possible. If shooting the sky, set the focus to the minimum focus distance. If shooting you computer monitor, set the focus to infinity.
Set the f-stop to the lens max but anything over f/22 works well. Set the ISO to ISO 100 and set the shutter speed so that the image is properly exposed.
When taking the picture, moving the camera around helps make things even blurrier so no need to keep things stable. The blurrier, the better.
What you will get is a horrible out of focus image but properly exposed. The only thing that will be anywhere near in focus will be dust/grime/pollen/hairs which are sitting on top of the sensor.
If you really want to shock yourself, import the image into something like Photoshop and play with the levers and curves and you can make the dust speck literally pop out.