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