[Erythematous papules on the upper chest wall].

The pathologic study showed a proliferation of vascular structures in the dermis, mostly capillaries with prominent endothelia, together with marked stromal cell hyperplasia and the presence of multinucleated giant cells, frequent mast cells, lymphocytes, and plasma cells (Figures 2 and 3). On immunohistochemical analysis, the vascular structures were positive for CD34 and the stromal cells for factor XIIIa and CD68. What Was the Diagnosis? Figure 2. Hematoxylineosin, ×20.