Jesus christ I hate it!

Its been sunny for the paast week, not even "summer" weather just kinda mid spring sunshine...and I already have a massive patch of it on my forearm.
Its itching like mad, I hate the fact that my forearms get completely ruined every summer!
Anyone else suffer from this? Anything you use that actually works?
Because the cream the doctors have given me since I was 7, DOES NOT WORK.
They also tell me to cover my arms up, not being funny but when its 31 degrees outside you hardly feel like wearing a bloody cardigan!
Help, its driving me INSANE.