Urticating papules

CASE #1

A man, aged 43 years, presented with a pruritic eruption that had been present for three months. The eruption began on his trunk and then spread to the proximal extremities. Extreme temperature changes and alcohol consumption aggravated the lesions. A review of systems was otherwise normal. Medical and family histories were unremarkable. Physical exam revealed reddish-brown macules and papules ...