And although “spontaneous” is within the identify, there are particular well-known triggers for flares, together with an allergic response, publicity to warmth or chilly, heavy vibration (for instance, from jogging or utilizing a garden mower), infections, strain on the pores and skin (like a decent waistband), stress, and daylight. “These aren’t the reason for hives however, slightly, aggravating elements,” says Jessica Hui, MD, a pediatric allergist and immunologist at Nationwide Jewish Well being in Denver.
If you’re uncovered to certainly one of these triggers, your physique releases immune system chemical compounds, equivalent to histamine, into the bloodstream. The response results in the event of purple, purple, or skin-colored welts (typically referred to as wheals) that may differ in measurement and form. The welts can seem, fade, and reappear all through the physique, making your pores and skin itchy, swollen, and uncomfortable.
