my son had severe hives when in about the 8th grade. it followed a severe car wreck a few years earlier.
stress? learning how to relax? the doctors gave some sort of steroids if memory serves. it helped.
he grew past it. the hives were around his midsection and waist. he would just about claw himself to death when they set in. avoiding chocolate, food coloring, plenty of fresh air, water and exercise. he grew out of it. hasn't been bothered since then, but it was a mystery, mostly.
his son, two years old, is healthy as an ox.
