Hi,
This seems to be an outbreak of hives.Hives is an allergic skin reaction causing localized redness, swelling, and itching.Hives is a reaction of the body's immune system that causes areas of the skin to swell, itch, and become reddened (wheals). When the reaction is limited to small areas of the skin, it is called "urticaria."
A wide variety of substances may cause hives in sensitive people, including foods, drugs, and insect bites or stings.