|
| Fig. 23.6 Lesions of urticarial vasculitis demonstrating an annular appearance, with some areas showing a violaceous hue due to extravasation of red blood cells. (Courtesy of the JLA Collection.) |
The individual lesions of vasculitis may resemble those of idiopathic urticaria; however, they may feel firmer, tend to persist for greater than 24 hours, and, on clearing, they tend to leave an ecchymotic area due to leakage of red blood cells into the perivascular tissue (Fig. 23-6). Associated systemic symptoms, such as arthralgias and myalgias, are also common. The erythrocyte sedimentation rate is often increased, autoantibodies may be present, and there may be evidence of renal disease.
