usually signs of gang initiations.
sometimes new gang members, go through the process of "intervention", which is a few tasks that a entering member must do.
depending on the gangs, and the severity of them, normally are cuts on the hand signifying which gang one is in.
bloods initiate members why leaving marks on the right hand of new members, while the crips leave their marks on the left hand.
these type of markings are usually very severe as to leave a long-lasting life.
also, usually a member while get a fresh gang cut mark or wound depending on how many people he has killed.