Look at his Obama’s hand showing in the picture.It is white up to above the wrist and then cuts off in darker after that in a strait line.
Aha! The other photo.
The color does look lighter.
One thing about hands - they are as distinctive and individual as faces. If we could find a bunch of photos of 0bama’s hands now, in many different angles and positions, and compare them to the alleged photos of him throughout his life (since adoleecence, children’s hands are different from adults), this might be helpful.