How did Vader get that scar on his head in Return of the Jedi?

Many pundits have wondered since Return of the Jedi, what was the origin of Darth Vader's scar on the top of his head?

You know the one on the Sebastian Shaw version of Anakin Skywalker in Return of the Jedi?

Je te presente:

Fans have long wondered who did this to Vader.  

The scars below Vader's left eye? That's known.

General Obi-Wan Kenobi was the cause of that - when he had the high ground and left Vader for dead, the lava ignited Anakin and the scars were caused as a result. 

Vader clearly suffered disfiguring damage as seen in Revenge of the Sith:

And those are the cheek scars seen Vader's Return of the Jedi visage. 

But what about the top scars on the head? 

Was it Ashoka when she opened up Vader's helmet in the glorious episode of Star Wars Rebels?

NO. 

It was not Ashoka, as he opened the right side of Vader's face mask:

It's revealed in the season final of Obi-Wan Kenobi that it was Obi-Wan himself who scarred Vader - in their third clash no less. 

You can see in this screen grab that there looks to be a wound near the top - it was my 9 year old son himself who noticed this and told me that Vader's 'brain had been opened up':

So there you have it, if you were ever wondering how Darth Vader got the scars on the top of his head, it was probably Obi-Wan Kenobi as advised by my son. 

A cynical viewer however might say it was not this incident that caused the scars:

But then, Kenobi's saber shot did go a long way up the head:

You be the judge?

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