Substances that are inhaled, eaten or touched may be the cause. Hives are not contagious. The rash that occurs with hives is red and blotchy. Hives may or may not cover the child's entire body. The rash often moves from one part of the body to another and may seem to come and go.
Hives can last from a few hours to several days.
The rash which occurs with hives is very itch. Scratching may cause the rash to last longer. If you are aware of the cause of your child's hives, it will be necessary to avoid the substance that caused this reaction. If your child's lips or eyes should become swollen or if any other problems come up, call your child's doctor. If your child has trouble breathing, go immediately to an emergency department or call an ambulance immediately.