Here's a quick trick to reducing hotspot. Usually if the flash or strobe is not diffused enough a hotspot can appear. This could also appear if the model has oily skin. If you shoot out door during mid-day, the sunlight could reflect back a hotspot. I created a quick 2 minute video on how to reduce a hotspot.Quick PS trick to reduce hotspot
1.) Duplicate the layer (Command + J)
2.) Select the Patch Tool
3.) Make a selection around the hotspot
4.) Drag or move the selection to another similar location
5.) Deselect the selection (Command +D)
6.) Lower the Opacity of the top duplicate layer to around 30% - 50%
Hope this helps!
II, Canon 100mm f/2.8L Macro...