noun
rubefacient
A substance that causes redness of the skin, used in medical or pharmacological contexts. Rare term.
引赤薬は、皮膚の血行を促進するために使われることがある。
Rubefacients are sometimes used to promote blood circulation in the skin.
Compound of 引 (in, 'draw, pull') + 赤 (seki, 'red') + 薬 (yaku, 'medicine, drug'). The exact historical derivation is uncertain; the term appears to be a modern medical coinage.