A small speck that shows up only in some photos is most likely dust inside the camera, possibly on or near the sensor, rather than a major internal failure. These spots can seem random because they’re often more visible at narrower apertures and less noticeable in other shots.

On a compact camera like the S950, internal dust is less common than on an interchangeable-lens camera, but it can still happen. If cleaning the front lens element doesn’t change anything, that supports the idea that the dust is inside rather than on the outside glass.

Because compact cameras aren’t designed for user sensor cleaning, avoid disassembly. If the camera is still under warranty, contact Sony or an authorized service center. A gentle tap may sometimes dislodge dust, but do this cautiously since impact can also damage the camera.

So: likely dust, not necessarily something “going bad,” but service is the safest fix if it persists.