There isn't just one tool. It would be a combination of many tools plus a bit of freehand drawing skills. Once you've removed the blob, the hard part is to replace it with a realistic view of the missing parts of the man.
For this particular image, you are lucky that his torso is pretty much facing us full on. You could get away with copying the left half of his torso, flipping it horizontally, and placing it on the other side. I did this very quickly and sloppily in five seconds and got this:
Some further tweaks with the Warp tool can fix the collar and waist area, something like this:
Other things to consider:
- As you can see on his face and neck, the left side of the image is in shadow and the light is coming from the right. On the copied & flipped portion of the torso, you'd need a Levels adjustment to lighten the shadows, simulating the light direction.
- I'm not sure what the white highlights on his chest are (not the medallion), but there probably shouldn't be two of them. On the flipped portion, use the clone stamp to get rid of that.
- You could probably use the same copy & flip technique on the belt and waistline of his pants.
The hardest part is to reconstruct the missing portion of his jaw and face. His head is turned at an angle, so you can't really copy from the left half of his face. To start, open a Levels adjustment layer and move the midtone slider to the left, to lighten the image, something like this. Then fill the mask entirely with black.
Using a soft brush with the Flow set very low (around 5%), gradually paint with white in the mask to lighten the shadows around the missing parts of the jaw and face. Like this:
From here, use the same soft brush with low flow, sample a color of the highlighted portion of his cheek or chin, and gradually paint that color to further lighten his face. You can add a small amount of gaussian noise to try to match the graininess of the rest of the image.