Leucocytoclastic vasculitis and influenza vaccination.

Influenza vaccination is recommended for all people over 75 years of age and for an expanding range of other indications. Side-effects of influenza vaccination are usually mild but we describe four cases of leucocytoclastic vasculitis following influenza vaccination. The four patients, who were all elderly, presented with cutaneous vasculitis but all had abnormal urinalysis suggestive of associated renal involvement. Since 1974 only 10 cases of vasculitis following influenza vaccination have been reported in the literature. The clinical features of these cases are reviewed. As the use of influenza vaccination is likely to increase, dermatologists should be aware of the possible association with vasculitis.