Hives can appear anywhere on the body, such as the:
- legs
- arms
- trunk
- face
Hives on the legs
Some people have “papular urticaria” in reaction to insect or spider bites. It usually affects children who have not yet developed immunity to these bites. The lesions can develop anywhere, but commonly occur on the legs.
Below are some typical features:
- The characteristic itchy red bumps, known as papules, form in clusters.
- Each papule measures 0.2 to 2.0 centimeters across and has a central point.
- They may be fluid-filled.
- New papules may appear as old ones disappear.
- A new insect bite may cause papules to reappear.
Hives on the face
When hives results from an allergy or sensitivity reaction, it can significantly affect the face, for example, by causing swelling in the lips.
The swelling can become more widespread and affect the mouth, throat, and airways. In this case, the person may find it hard to breathe. This is an emergency, and the person needs urgent medical care. They are at risk of developing a life threatening condition called anaphylaxis.
If the person has an autoinjector, start by helping them use it. Then, call 911, or the local emergency number, and stay with the person until help comes. If a specific object appears to have triggered the reaction, it may be helpful to take a sample to the hospital.
Anaphylaxis
Anaphylaxis is a severe allergic reaction that can affect the whole body.
It can lead to serious breathing difficulties and a loss of consciousness. It is a medical emergency and can be fatal if treatment is delayed.
If a person develops hives, they need to be aware of any further symptoms that could indicate an anaphylactic reaction.
Immediate medical attention is necessary if the person experiences:
- nausea and vomiting
- swelling of the lining of the mouth, tongue, lips, and throat, causing difficulty breathing
- cold, clammy skin
- a rapid heartbeat
- faintness or lightheadedness
- an unexpectedly abrupt feeling of intense anxiety
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