That's pretty insane that even at that low BF% and done up with tan, they still stand out like that.
Happens a lot; scar tissue builds up under the skin, being hardened skin, doesn't thin out like regular skin. Usually happens to taller guys with skinny limbs to start with.
One could blame drugs but the guy just won the overall so let's wait a day or two to start the bashing a la getbig.