However careful you are with Giant Hogweed, it is not enough! Fully gloved up for some dead-heading at Tyninghame a couple of weeks ago. But 3 days afterwards see the photo of my wrist. And the same area 2 weeks later.
The only explanation I can think of is that I looked at my watch, by moving the elasticated sleeve of my glove away using the other gloved hand, which had sap on it. I have since got much better gloves!