So one of my pullets has a large black lump on her leg. She hasn't been limping or anything else... yesterday when I came home there was blood EVERYWHERE. I was sure there was a dead chicken... but nope everyone was alive and happy and fine. After I got to looking around it turned out the large black lump on her leg had busted open and was the cause of the blood. She appeared fine... the bleeding had stopped, none of the other chickens had tried to hurt her, and she again- wasn't limping or acting weird. She had this thing on her leg when I got her three weeks ago for free. I didn't notice it though until after I brought her home. Someone mentioned to me that an abscess could be contagious to the other chickens? Is that true? Anyway, how would you handle this? VERY novice chicken owner here and I'm not sure what I should do or what this even is... Sorry the picture sucks... she's a nervous bird and it was the best I could get without grabbing her.