Latex

Essentially, fig sap. Often identified as the milky substance that leaks from the stem of a picked fig, indicating that it was picked too soon. Latex can be caustic to some, who have a natural allergy or intolerance. Or irritation can be acquired by frequent exposure. The UV of the sun can acerbate the irritation of latex on the skin. Latex can be difficult to remove via normal detergents. I’ve found orange oil is most effective for removing fig sap. See the Britannica article on Latex.