A young man with multiple reddish papules and nodules on the trunk and extremities

A 23-year old man was presented with multiple papules andnodules (25 lesions) on the trunk and proximal extremities(Figure 1). Two or three lesions were appeared at childhood andincreased to 25 lesions in early adulthood. There were variationsin size from several millimeters to 2 cm with spontaneous andinducible pain especially in exposure to the cold environment.Same lesions were present in his brother, aunt and uncle. Weperformed biopsy from one of the lesions on the trunk.