Clivaz

A particularly objectionable pustule (or pimple) growing on top of a genital wart. Typically develops after too much time spent in Soho restaurants, through a combination of louche living, sedentary positions, and eating in crappy, over-rated restaurants and clubs.

I've got a terrible itch in my pants, Brian. It's my Clivaz flaring up all over again. I'd burst it, but the whole area's so sore, and I'm in public.