This allergic reaction is called hives.Hives are red, itchy welts or swellings on the skin that often come in clusters. They may simply look like large red circles. In doctor speak, hives are known as "urticaria."
Hives can appear anywhere on the body, cropping up either in one small area or covering large patches of skin. They most often occur as part of an allergic reaction. No one lesion lasts more than 24 hours, but new ones may continue to appear until the condition resolves.
Comfort is the main goal of treatment, since most hive outbreaks are relatively minor and short-lived. To soothe itchy skin, try cold compresses, calamine lotion, a cool shower, or a tepid bath with a few tablespoons of cornstarch (the kind sold in drugstores) thrown in. Try an over-the-counter antihistamine to reduce your body's response to the irritant and to relieve pain.
Thank you very much because I am having an allergic reation to hemp and was ready to the ER.