This document discusses hot applications, which involve applying a hot agent to the skin to relieve pain and congestion. It lists the primary effects as peripheral vasodilation and increased blood flow and secondary effects as decreased blood viscosity and increased oxygen consumption. Therapeutic uses include decreasing pain and muscle tone and promoting healing. Contraindications include malignancy, impaired kidneys, open wounds, and high body temperature. Precautions are described to safely administer hot applications and avoid complications like burns.