|Toxicodendron radicans aka Poison Ivy|
While it seems that the rash spreads itself up my arms, this is not the case. Different parts of my arms and hands react at varying rates and severities to the same exposure to urushiol, the chemical that causes the allergic reaction. Sometimes I get repeated exposures if I haven't washed everything that came in contact with the plant (typically my boot laces) but the oozing rash itself does not beget more rash.
This post was brought to mind when my wife brought home a new brand of toilet paper. I'm all about sustainable products (especially when thay are actually eco-friendly and not just marketed as such) - but did this brand take 'going green' too far? The graphic designer responsible is either having a good laugh, or they need to take botany 101.