Principles of cold compress and hot compress:
Cold compress
Its main purpose is to promote local vasoconstriction, reduce local bleeding, reduce the sensitivity of nerve endings and reduce the occurrence of inflammation.
heat
Mainly to promote the regression of inflammation. In the early stage of inflammation, hot compress can promote the absorption and dissipation of inflammation; In the later stage, inflammation can be limited, which is helpful to remove necrotic tissue and repair tissue. Will not leave bruises on the eyes. It's ugly.