A perianal vesicular eruption occurred in association with an epidemic of "Hong Kong" influenza affecting approximately 80 of 160 boys and girls being treated for chronic intractable asthma at Children's Asthma Research Institute and Hospital, Denver. Laboratory studies did not demonstrate any infective cause for the eruption. It may represent a previously unnoticed cutaneous manifestation of Hong Kong influenza.
Leizer Molk, Maj Larry Erickson, Guinter Kahn. Perianal Vesiculopustular Eruption Associated With Hong Kong Influenza. Arch Dermatol. 1969;100(5):570–574. doi:10.1001/archderm.1969.01610290054011