User blog comment:MarinaTheTenkaiKnight/The Agar.io Games Trilogy - Prereserves/@comment-25205574-20150627061614/@comment-25924729-20150628050208

Heres another go at it:

When a team member dies, a scar is burned into the flesh of all other members of the same team, to keep track of who'se still alive. I dunno how this will be useful or harmful in any way, but it sounds logical to me.