In The Kite Runner, what might the marks on Assef's forearm be?First impression: Blood on his shirt; Assef seems he is a meticulous dresser....

Assef may come from a wealthy family and, in the past, may
have been a meticulous dresser, but his decision to join the Taliban meant that a few of
his habits had to change. He is proud of the Russian jailer that he killed, and brags
about the many Hazaras he murdered in Mazar-i-Sharif. He is probably equally proud of
the stoning death in which he earlier participated, and he wears the blood as a badge.
He may also have deliberately failed to change his clothes in order to further shock
Amir. As for the track marks Amir saw on his arms, they were probably from injecting
heroin or another drug.