The subject of Queen Anne's lace has been dropped, but I wouldn't like anyone here to have the purple-black lesions on the arms which I got from pulling several dozen of the wet plants. So I am providing a quotation from this site: carrotmuseum.co.uk/wild.html

"Queen Anne's Lace is also considered toxic. The definition of toxic includes causing harm, detrimental to health etc, but not necessarily poisonous. Therefore contact with the skin can be toxic. Overall, most people classify the wild carrot leaf as "mildly toxic". The leaves contain furocoumarins that may cause allergic contact dermatitis from the leaves, especially when wet."

(They gradually went away after a doctor prescribed a strong cortisone-type ointment.)