When I started mtx, I developed rashes on both my hands and legs. They were very itchy. I had hard time to deal with them. I could not scratch them to avoid bleeding.
Few weeks ago, not sure if it was due to heat now, similar rashes and itchiness came back on both my hands and legs. The very first week, I applied only moisturizer but they were getting worse. Then I remember I used sea salt to rub on them after shower, so I did. The itchiness reduced after I rubbed them with sea salt. I continued with the moisturizer after that. A few days later, the rashes and itchiness reduced a lot. Now they are almost gone.
I do know a lot of RA patients have these problems hence I would like to share my experience and hope it helps. No harm trying out.