I disagree with mathogre. The highlights being blown is irrelevant. I don't do a lot of 'product' work, but blowing highlights is a common technique for eliminating shadows. Once a highlight is blown (overexposed to the point of no detail), it does not matter by how much. In this photo, the highlights are background, with no detail, and totally NOT part of the shot.
On my monitor, the 'spot' on the right shoulder blade is obvious. It has a 'blob' component about half the size of the 'spot' covering the lower 1/3 - 1/4 of the 'spot', and bleeding downward. There is also a smaller, nearly round spot just down and to the left of the big spot. This smacks of lens flare, and that is my guess.
Which could lead back to the blown highlights. If the BG is being intentionally blown, and way too much light is being used, flare may be the result. Or it could just be a cheap filter. Or lack of an adequate hood. If it is flare, correcting the cause would be preferred over repairing the shot.
EDIT: Snydremark was posting at the same time I was typing the above. I agree with his guess that the light causing the problem is from camera lower left.