You actually do have an illuminated dust particle in front of the lens (quite close...maybe on the lens) which the camera is focusing through...though you may not have intended to have the flash fire, it appears that it actually did (according to your EXIF information, the flash fired, and that would match what looks like the flash reflection in the pupils). And a compact camera firing a flash will nearly always illuminate the small dust particles in the air between the camera and the subject, and due to the small distance between lens and flash on these cameras, the reflected light from the flash will 'bounce' right back into the lens. Because the dust is outside the lens, the camera is actually focusing past it, which makes a very small particle end up looking like a big, diffuse blob (different than dust on the sensor inside the camera, which often shows up as a smaller, more dense spot or blob).