If you are bothered by this symptom you have dermatographia.
What is dermatographia? 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.
Most people who have dermatographia don't seek treatment. If your signs and symptoms are especially bothersome, your doctor may recommend allergy medications.
Signs and symptoms of dermatographia may include:
- Raised red lines
- Swelling
- Inflammation
- Hive-like welts
- Itching
The exact cause of dermatographia isn't clear. It may be caused by an allergic response, yet no specific allergen has been identified.
Simple things can trigger symptoms of dermatographia. For example, rubbing from your clothes or bed sheets may irritate your skin. Sometimes, dermatographia is preceded by an infection, emotional upset, or medications.
Dermatographia can occur at any age, but it tends to be more common in teenagers and young adults.
Source:
https://www.mayoclinic.org/diseases-conditions/dermatographia/symptoms-
causes/syc-20371411
