His mother Alison McGee said her 12-year-old son was doing well after surgery at the Royal Hobart Hospital on Friday to modify skin grafts on his neck to match his growing body.

"He's happy but a bit annoyed at the bandages and dressings all over his neck," Ms McGee said.

"He's not in too much pain and we're pleased to be going home today."

Spencer had an overnight stay in hospital and will have to return on Thursday for a check-up.

Ms McGee said Spencer would need further surgery in six to eight weeks and she hoped there would be no delays.

"We've been given the impression he has a date for the next surgery so I hope we don't have to wait another 18 months," she said.

"It has been really difficult for us having to wait.

"They've only got one machine but I don't understand at all why a 70-year-old man with skin cancer can access the man and a 12-year-old with his life ahead of him has to wait 18 months."

The delay in his surgery was likened to forcing Spencer to wear jeans that fitted him years ago.

His plight was raised in Parliament.