I had a similar problem about
10 years ago when I went to Hawaii in January. Where my arms and legs were exposed to the sun I got a itch that lasted for about
24 hours. Absolutely no rash! I spent the day scratching with a hair brush and it was so awful that I ended up going to the ER at about
4AM. They gave me an IV of Benedryl. I'm not sure if that helped but it knocked me out for the rest of the day. The next day I was fine.
I was on 6mp and Asacol at the time. My doctor told me that this reaction had been reported from 6mp. It was awful, and ruined my vacation. The rest of my vacation, I was covered head to toe! Mary