This seems like an overload of the cameras sensor photodiodes creating a spill effect into adjacent pixels. Since no real data is present for the pixel, and color is selected and it is generally purplish. When there is an unrealistic contrast, or when some or the entire image is not acceptably exposed. The image will need to be exposed properly to reduce this effect, and that will only occur when exposure is pushed beyond what is normally acceptable. Try re-shooting with a different exposure.