It is also used there as a rubefacient.
"The Medicinal Plants of the Philippines"
T. H. Pardo de Tavera
These objects are best attained by means of the galvanic current, which should be employed of sufficient intensity to produce a rubefacient effect.
"The Electric Bath"
George M. Schweig
When applied in lotions every night for five or six times consecutively, it will heal indolent ulcers; and its rubefacient effects serve instead of those produced externally by mustard.
"Herbal Simples Approved for Modern Uses of Cure"
William Thomas Fernie