Dermatographism

Skin Writing

Overview

Dermatographism (also spelled dermographism) is the most common form of physical urticaria, in which firm stroking or scratching of the skin produces a linear wheal (hive) that follows the path of the stimulus. The wheal appears within minutes and typically resolves within 30-60 minutes. It is caused by mast cell degranulation in response to mechanical pressure and affects approximately 2-5% of the general population.

Key Symptoms

• Linear raised wheals (hives) appearing within 2-5 minutes of firm stroking or scratching
• Wheals follow the exact path of the stimulus — you can 'write' on the skin
• Associated itching at the site of the wheal
• Wheals resolve spontaneously within 30-60 minutes
• Initial red line, followed by flare (surrounding redness), then wheal (raised line)
• Can be triggered by tight clothing, rubbing, toweling, or scratching

Affected Areas

Any area of skin that is stroked or scratched, Trunk, Arms, Legs, Back

Care Instructions

1. Avoid unnecessary scratching, rubbing, or friction on the skin.
2. Non-sedating antihistamines (cetirizine, loratadine, fexofenadine) are the first-line treatment.
3. Higher doses of antihistamines (up to 4x standard dose) may be needed for refractory cases.
4. Wear loose-fitting, soft clothing to minimize skin friction.
5. Moisturize skin regularly to reduce dryness and itching that leads to scratching.
6. See a dermatologist if symptoms are persistent or significantly affect quality of life.

Medical Disclaimer: This information is for educational purposes only and does not replace professional medical advice. Always consult a qualified dermatologist for diagnosis and treatment.

Prevalence: Common; affects approximately 2-5% of the general population