Hi,
My vasculitis (lower legs), and livedo reticularis (anterior thighs) both itch like mad before they appear, sometimes to the point that I feel like I'll go crazy if it doesn't stop....which is usually when it does!
I find that antihistimines such as fenofaxidine ease the itchiness, so if I know I'm starting to flare (for me that usually means vasculitis and fatigue) I add an antihistimine to my morning meds.
Cheers