Figure 1. (A) UV rash; (B) low power (5x) photomicrograph showing superficial and mid-reticular dermis with a prominent perivascular inflammatory cell infiltrate; (C) H&E stain at 200x total magnification, showing a brisk perivascular lymphohistiocytic inflammatory infiltrate (black circle) with numerous admixed eosinophils (blue circle). Endothelial cell swelling, mild erythrocyte extravasation (red oval), very focal probable fibrinoid degeneration of blood vessel walls (arrow), and surrounding karyorrhectic debris (green oval) are seen.

UV: urticarial vasculitis.