2. What Causes Dermatographia?

The underlying causes of dermatographia are unknown, but many doctors believe the resulting marks develop when the immune system becomes confused or overactive in response to stimuli, such as frequent exposure to rough surfaces. Heat and exercise can worsen symptoms for some people, although others are more affected by cold. Some cases may be related to persistent dry skin or exposure to common drugs, such as antibiotics.

Dry skin on soles of feet Alina555 / Getty Images

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