what can cause sudden hives on forearms one side of face & neck
In essence, your body forms an allergic reaction to stress. Unfortunately, stress can not be eliminated with histamine, so instead, the histamine just causes hives to appear on your face, neck, chest and other parts of your body.
They are typically quite itchy and have been known to cause a prickly or burning sensation - especially if touched. Stress hives can appear on any part of your body (face, hands, feet, arms, etc.) and can vary in size from as small as the eraser on a pencil to as large as a dinner plate. Stress hives, like a typical hives rash, have been known to spread from place to place, and smaller areas of hives can blend together to create larger areas known as plaques.