Dermographism: Understanding Skin Writing & Causes

Dermographism (Skin Writing)

Dermographism (dermatographia) causes red, swollen skin when scratched or rubbed. Affects ~5% of population; more common in women; usually begins in adulthood.

Cause

Thought to be a histamine reaction. Histamine releases too easily in response to minor trauma, causing wheal-and-flare reaction.

Symptoms

• Redness and swelling after scratching/rubbing
• Itching
• Possible blistering, wheezing, shortness of breath, dizziness, fainting (in severe cases)

Treatment

Often mild, no treatment needed. For bothersome symptoms:

• Antihistamines
• Corticosteroids
• Calcineurin inhibitors
• Phototherapy

Usually lifelong but can improve over time. Most people live normally with proper management.