Well my brother scratch me on the arm and its about less then an inch long. and it isnt really that deep and it didnt poor blod or anything. I didnt notice it until like 2 hours later because it didnt bleed. Anyways the next day it began to have like some light purple lines or dots under it. I accidently peel the scab off of it when it was itchy and the next day it began to have a light yellow color surrounding the scratch adn udner the purple part. What is this? i really dont know