The Slicer - S9-E7
Corrected entry: George's boss Kruger claims that the mole on his back hasn't changed in the past ten years from the picture on his desk. However the mole wouldn't be visible in the picture as you cannot see Kruger's back in the picture. Kruger is facing chest forward in the picture.
Correction: Kruger never says the mole is on his back.
Kramer even tells George the mole is on his shoulder.
Bishop73