its really not that interesting or as shocking as i might have made out. i used to get worms (playing outside, with dogs, sucking my thumb etc) - one symptom of worms is an itchy arse (hence dogs dragging their hind quarters about) - one of my parents thought baby milk would sooth the itching - i think it came in a pressurised bottle with a thinish nozzle - anyway, was applied a bit enthusiastically / carelessly and ultimately internally -
i would say it stung like buggery but that might not be quite appropriate.
That's mental!
How old were you? 14?