Urticaria pigmentosa presents as multiple hyperpigmented macules/papules that urticate (wheal, flare, and itch) on rubbing — a positive Darier's sign. This is the most common cutaneous manifestation of which condition?

• AMastocytosis (cutaneous/systemic mast cell disease)
• BUrticarial vasculitis
• CDermatitis herpetiformis
• DBullous pemphigoid
• EErythema multiforme