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I have burnt myself on something in the garden. It is very like a
Euphorbia burn but I havnt any Euphorbia. Any ideas what it could be?

Ruta graveolens, the blue rue?

You may find that when the area heals, it's become sensitive to
sunlight and the itching/ blistering/weeping returns after sun exposure.
If so, keep it covered/use a total sunblock cream.

Janet.