Rash on my leg..?

Savana

About a week ago my leg started to itch really REALLY badly, so I gave in and itched to my hearts content. A day or so after my frantic scratching, peeling skin had revealed itself; I applied aloe on to sooth the irritation. Over the next couple days it flared up to become this gnarly thing on my leg, I've bought some antiitch cream and it'll be a couple of days before I can properly go to the dermatologist.

The rash about the size of a dollar coin and burns like hell.

Anyone have a diagnosis..?