Dermatographic urticaria

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Prab R. Tumpati, MD — Editor-in-Chief, WikiMD Medical Encyclopedia
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Dermatographic urticaria
File:Welt on wrist.jpg Example of dermatographic urticaria on the wrist
Synonyms	Dermographism, dermatographism, skin writing
Pronounce	N/A
Specialty	Dermatology
Symptoms	Raised, red lines on skin after pressure
Complications	N/A
Onset	Any age, commonly in young adults
Duration	Varies, can be chronic
Types	N/A
Causes	Unknown, possibly immune system response
Risks	Stress, infection, allergy
Diagnosis	Clinical examination, "skin writing" test
Differential diagnosis	Urticaria, allergic reaction, contact dermatitis
Prevention	N/A
Treatment	Antihistamines, avoiding triggers
Medication	Cetirizine, Loratadine, Fexofenadine
Prognosis	N/A
Frequency	Common, affects 2-5% of the population
Deaths	N/A

Dermatographic urticaria

Dermatographic urticaria (also known as dermographism, dermatographia, or skin writing) is a skin condition characterized by the appearance of weals or welts on the skin as a response to scratching or firm stroking of the skin. It is the most common form of physical urticaria.

Symptoms

The main symptom of dermatographic urticaria is the rapid onset of raised red skin welts. These welts can appear anywhere on the body and can be triggered by a light scratch or pressure. They usually disappear within 30 minutes. Other symptoms can include itching, a burning sensation, and rarely, angioedema.

Causes

The exact cause of dermatographic urticaria is unknown. It is thought to be caused by an overactive immune response to a stimulus such as pressure or scratching. Some people may have a genetic predisposition to the condition. Certain factors can exacerbate symptoms, including stress, hot baths, alcohol, exercise, and certain medications.

Diagnosis

Diagnosis of dermatographic urticaria is usually based on the characteristic appearance of the welts. A doctor may also perform a skin writing test, where they lightly scratch the skin with a blunt object and observe the reaction.

Treatment

Treatment for dermatographic urticaria primarily involves avoiding triggers and managing symptoms. This can include avoiding scratching, wearing loose clothing, and using over-the-counter antihistamines. In severe cases, a doctor may prescribe stronger antihistamines or other medications.

See also

• Urticaria
• Angioedema
• Skin conditions
• Allergies