Hi,
You wouldn't believe how many medications cause dermatologic issues. I take multiple meds so am no stranger to rashes. I had no rash problems before the meds. Now I have rashes all the time. The area most affected is the chest. I am grateful for that. Sometimes I get it on my legs. It is an ongoing thing. One of my drug books has tables with the different dermatological conditions caused by the meds, listing which drugs cause what skin disease or condition. It is a very, very long list...
As for what you can do about it....in some cases the discontinuation of the offending medication is enough for the skin problems to clear up and then everything returns to normal. Which, unfortunately, does not apply to me as I am stuck with my meds for life. I hope you'll find a way to heal the exzema.
Good luck,
flowergirl