Urticaria, or hives, is a condition in which red, itchy, and swollen areas appear on the skin--usually as an allergic reaction from eating certain foods or taking certain medications, though sometimes the cause may be unknown. Hives can vary in size from one-half inch to several inches in size. Hives can appear all over the body or be limited to one part of the body.
The following are other possible causes of hives:
Dermatographism. These hives are caused by scratching the skin, continual stroking of the skin, or wearing tight-fitting clothes that rub the skin.
Cold-induced hives. These hives are caused by exposure to cold air or water.
Exercise-induced urticaria. These allergic symptoms are brought on by physical activity.
Solar hives. These hives are caused by exposure to sunlight or light bulb light.
Chronic urticaria. These are recurrent hives with no known cause.
A diagnosis of hives is usually made based on a complete medical history and physical examination.
Avoidance of the allergen is the best treatment for hives. If the hives were caused by a medication, strict avoidance is necessary.
Specific treatment for hives will be determined by your child's doctor based on:
Your child's age, overall health, and medical history
Extent of the reaction
Your child's tolerance for specific medications, procedures, or therapies
Expectations for the course of the reaction
Your opinion or preference
Your child's doctor may also prescribe the following medications:
Antihistamines. These help to decrease histamine release that may help to decrease the symptoms of urticaria. Some examples are diphenhydramine (Benadryl) or hydroxyzine (Atarax). These medications may make your child drowsy.
Nonsedating antihistamines. These work similar to antihistamines, but without the side effect of making your child drowsy. These might include cetirizine (Zyrtec) or loratadine (Claritin).
If your child is having difficulty breathing, your child's doctor might use an injection of epinephrine to help decrease the swelling and the itching. Your child's doctor may instruct you on the use of an emergency kit that contains epinephrine to have near your child in case of future episodes. Discuss this with your child's doctor.