Fig. 1.

Sweet syndrome. A. Skin lesion nine days after vaccination (left arm). Painful erythematous plaques of various sizes were scattered on the four extremities. Skin biopsy histological findings. The infiltrates correspond to many histiocytes, lymphocytes, but largely hyposegmented “pelgeroid” and mature neutrophils at scanning magnification, B, at 10×, and C, at 40×. D. Immunohistochemistry with CD68 and Myeloperoxidase that discriminates histiocytes and “pelgeroid” polymorphonuclear cells, the MPO shows a diffuse coarse granular cytoplasmic reaction in the last.