i have no way of blindly diagnosing (or treating) your skin eruption over the internet. you would need to have this itchy rash examined. i am guessing that you feel you have poison oak (or ivy depending on where you live in the world) but again this is something that a medical provider would need to see and examine.
i was in the woods and now i have an itchy place on my arm that just looks like a scratch. its 3" & has a few bumps