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
Answer is D. (Refer: Fitzpatrick's Dermatology in General Medicine, 8th edition, pg no: 414-420)
Variant forms of physical urticaria