What Causes Itching Followed By Bumps And Scabs?

Hi, may I answer your health queries right now ? Please type your query here...my friend recently got a disease. I'm not sure what it's called but it starts with an i. She said its in her blood and it makes you itchy and you get bumps that you scratch that turn to scabs and stuff. Im trying to figure out what it is. Please help me this disease could be deadly