That certainly looks like a poison ivy rash. I've dealt with poison ivy exposure and the rash off and on most of my life. The plant grows in profusion all over the wooded and shaded areas of my property now. But, the rash outbreaks are much less severe now than as a child. Treatment advice for poison ivy is much like golfswing advice - it varies with whom you're getting it from. Steriod treatment may help for severe cases, but it usually gets more credit than it deserves because the rash is likely already in the resolution stage by the tome such treatment is sought. Generally, from my experience the rash has to run its course, which can be up to 3 weeks. The only effective itch relief that i've experienced is exposure to a few seconds of mildly hot water. The itching becomes intense for a few seconds (reacting with histamine release), but allows hours of relief. This is also a method of determining if the rash is indeed from poison ivy or other urushiol bearing plant exposures, because few other itchy rashes respond this way.
