The best fix is to prevent it while shooting. If a patch of sunlight is hitting your subject, block it with a flag/scrim or other dark panel placed just out of frame. You can also use fill flash to balance the lighting so the bright and shaded areas match better.

Fixing it afterward is possible, but harder and often less convincing. You’d typically make local adjustments: darken the hot spot, lift surrounding shadows if needed, and carefully blend the transition so it looks natural. Curves or other selective tonal tools can help, and editing is usually easier if you shot RAW.

If the bright area is blown out, recovery may be limited. In general, catching the problem in the viewfinder and correcting the light on set will give much better results than relying on post-processing.