Moist Heat application is a warm or wet agent out on the skin to get deeper muscle tissue relieve.
Paraffin wax treatment is used for chronic joint pains. It is a heated wax you put the injured body part in to cover it in warm wax to be left on for a different time period depending on joint.
Heat application causes vasodilation. This is were the blood vessels grow larger allowing more oxygen and nutrients to help the healing process.
Cold application causes vasoconstriction. This is were blood vessels become smaller to help reduce swelling and decrease any fluid that could be present.