Urticaria is the medical term for hives. They are pink welts or swellings that can itch, burn, or sting. These rashes can vary in size from as small as a pen tip to as large as a dinner plate, and may join to form even larger swellings.
They often will disappear within a few hours. Some may last a few days or recur continuously over months or years. New hives may develop as old ones fade.
They can appear on any part of the skin. When they form around the eyes, lips, or genitals, swelling may be more than normal. Although frightening, the swelling usually goes away in less than 24 hours. Severe cases of hives may cause difficulty breathing or swallowing. If this occurs, seek immediate emergency care.
Anyone can get these rashes. Approximately 10 to 20% of the population experience at least one episode in their lifetime.
They typically are the result of an allergic reaction; however, there are many non-allergic causes. Finding the exact cause can be difficult.
Allergic reactions, certain foods, or medications are the common causes of hives.
Dermographism urticaria forms after stroking or scratching the skin, and can often occur with other forms of hives. This is the most common reason for chronic hives. These appear within a few minutes along the path of rubbing or scratching and last less than an hour.
This type of rash usually disappears in a few hours or a day. An over-the-counter antihistamine can provide relief and reduce itchiness.There are many antihistamines available. You may have to try several types until you find the one that is most effective for you.
If you have hives that do not resolve within a week or do not respond to over-the-counter antihistamines. see your dermatologist. Your dermatologist may prescribe stronger antihistamines or combine an antihistamine with other medicines to control it. These other medications can include:
There is also a new US. Food and Drug Administration-approved treatment for chronic idiopathic urticaria, which is caused by an autoimmune reaction. Talk with your dermatologist about whether this medication is right for you.
In severe, acute cases, an injection of epinephrine (adrenaline) may be necessary. Always seek immediate emergency medical treatment if you experience difficulty breathing.