How to amend weird light glare on mans head!?

Select the area with the Lasso, feathered a bit. Blur it slightly and then add a small amount of black and white gaussian noise. Sample the face with the brush tool set to color mode at maybe 30% fill, and brush over the top of the subject's head. This will give you the best looking result in a blown out area.

The short and blunt answer is that it's blown out and clipped in the sensor, so abandon all notions of "repair". There's nothing left to repair.

And there is certainly no "quick fix" as you say.

That's not to say it can't be fixed, but be clear that it needs to be rebuilt and reconstructed. There's a million ways to do that, and Myra posted one.

One way to address the desaturation and glare on his head would be to apply a gradient to the area and use a combination of the Spot Healing Brush and the Blur tool. Here's how:

1. Select the top of his head with any of the selection tools
2. Set the Foreground color to a highlight skintone (try a highlight in his furrowed brow)
3. Set the Background color to the darker skintone above his ear
4. Select the Gradient tool and in the Options bar (Window > Options) set the gradient to Basics > Foreground to Background and the gradient type to Radial Gradient
5. Draw a gradient from the center of his head outward and adjust as needed
6. In the Layers panel, set the Blend Mode to Color
7. Use the Spot Healing Brush and/or the Blur tool to blur the edges of the area on his head where the glare is most prominent