I thought the scars looked similar, but I am no professional.
The alternative theory is a motorcycle accident in Kenya.
Yes, because although it has been said that Mark had a younger brother named David who was killed in a motor-cycle accident, no one can find David. He exists only in one image with birth/death dates of 1967-84, some at 1967-1984.
What most people are not aware of, is that there are a number of Kenya sourced articles that place Zero in Kenya in 1983. Something major is amiss there.
A bit of digging reveals that it is pretty tough to find when Obama's half-brother David Ndesandjo died; some sites put it at 1987....
The one and only image...Birth: 1968. Death: 1984.
They just cannot make up their minds...
Looks like a Hawaii teenager to me...AND WHY IS ONE ARM SO MUCH DARKER THAN THE OTHER?