What is the primary function of a rubefacient?

The primary function of a rubefacient is to enhance blood flow to the skin. Rubefacients are substances that, when applied topically, cause dilation of the superficial blood vessels. This increase in blood flow can lead to a warming effect, which can promote healing and bring nutrients to the area.

This effect is particularly useful in treatments aimed at relieving muscle tension or pain because the increased circulation can help to alleviate discomfort and promote recovery. While other options like reducing inflammation or soothing irritated skin might occur as secondary effects of increased blood flow, the main characteristic of a rubefacient lies in its ability to stimulate circulation in the skin, making it an effective tool in certain therapeutic applications.