When the temperatures are up outside, the skin on your face struggles to regulate its temperature. Perspiration is released to cool it down but in the meantime blood vessels dilate, the tissue gets slack & puffy then irritation & breakouts ensue. Chilling the skin during these times not only halts the cycle of irritation but helps firm the skin and sculpt the face.
For years I have been a proponent using cold in a facial keeping a refrigerator full of herbal gel concoctions at my finger tips and ice to roll on the skin. The hot/cold strengthens blood vessels and seems to tighten up the underlying connective fibers in the skin for a more firmed facial complexion. This thought process is catching on.