Unknown A child scratches his hand with a pen. A red wheal appears which persists for 30 minutes. What would be the diagnosis? A Atopy B Contact urticarial C Pressure urticarial D Dermographism 💡 Explanation A child scratches his hand with a pen. A red wheal appears which persists for 30 minutes. What would be the diagnosis? ✓ Correct Answer: D. Dermographism