Dermatographia is a condition also known as skin writing. When people who have dermatographia lightly scratch their skin, the scratches redden into a raised wheal similar to hives. These marks usually disappear within 30 minutes.

The cause of dermatographia is unknown, but it can be triggered in some people by infections, emotional upset or medications such as penicillin.

Most people who have dermatographia don't seek treatment. If your signs and symptoms are especially bothersome, your doctor may recommend allergy medications such as diphenhydramine (Benadryl).

Symptoms Causes Risk factors Complications Prevention

Signs and symptoms of dermatographia may include:

  • Raised red lines
  • Swelling
  • Inflammation
  • Hive-like welts
  • Itching

The signs and symptoms may occur within a few minutes of your skin being rubbed or scratched and usually disappear within 30 minutes. Rarely, dermatographia develops more slowly and lasts several hours to several days.

The condition itself can last for months or years.

When to see a doctor

See your doctor if your signs and symptoms are particularly bothersome.

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