1. Hot compress can increase local skin temperature, dilate skin capillaries, accelerate skin blood circulation, and help promote the metabolism of harmful substances in skin and the growth of skin keratinocytes. And cold compress is to reduce the blood circulation inside the skin, reduce the permeability of skin capillaries and slow down the local metabolism of the skin. So heat it up.

2. Hot compress can also soften the cuticle of the skin and increase the extensibility of the skin, thus helping to achieve the purpose of relieving fatigue and relaxing skin tension. Cold compress stimulates fatigue and awakens fatigue, but it cannot achieve the purpose of relieving fatigue and relaxing skin tension. So heat it up.