How do you use the milky substance in poinsettias?

A treatment by which fever is controlled is the traditional use of the milky substance in poinsettias (Euphorbia pulcherrima).

Specifically, the milky substance contains latex. There are other uses for that substance, such as poinsettia soap. But the longest-standing use is its incorporation into the natural healing techniques that continue to be used in Mexico since the times of the ancient Aztecs.