10th July 2023

You examine a 42-year-old man with known systemic mastocytosis. On rubbing a papular lesion on his back

You examine a 42-year-old man with known systemic mastocytosis. On rubbing a papular lesion on his back, you observe that it quickly becomes erythematous, raised, and itchy.

What is this sign called?

Select the SINGLE most appropriate option from the list below. Select ONE option only.