Yes they have done a GA - fortunately he was fine with it.
Actually, second time they offered him a local, but he wasn't at all keen!
We saw a plastic surgeon too (another wait for a referral!) He offered us three methods, but simple excision was his preferred option. He told us:
Laser removal was possible, but because this only affects the surface of the skin and these birthmarks are deeper there was a possibility it might grow back, and also the actual texture of the skin would change, and it wasn't ideal for such a large birthmark.
Skin graft would be more traumatic for him as there would be two scars. Also the end result would not be so cosmetically satisfactory, and a simple flat scar would be preferrable.
(ds2 asked the surgeon if it was possible to make the final scar look like a scar from a shark attack! )
Yes, they use the natural elasticity of the skin to stretch it over the bit they've cut out.
Now if it was me there would be no problem and they could cut out inches and still have plenty to stretch over, but ds2 is a skinny little wretch, so they can only do a bit at a time!
They basically cut out a slice of skin about 2cm wide (and the breadth of the birthmark), cutting out the 'full depth' of skin, then stretch over the skin from the edges and stitch it up firmly.
The plastic surgeons are great and can do this sort of thing in their sleep. We've had no problems at all so far, and it's looking really good already.