Use the polygon lasso tool to select a shape as below. The fill with white. Apply Filter > Distort > Radial Blur Zoom 100%. The result should be similar to below. Set the eraser as above and brush lightly around the edges of the shape until you have a similar look to the one below.Apply Filter > Blur > Gaussian Blur Radius 1.2. The result should be similiar to below Here is an example of it in use
