Jarring as it may sound, icing is really just the act of putting ice or cold products on the skin to reduce inflammation, puffiness, and redness. While dozens of TikTok videos show users putting actual ice cubes on their bare faces to get a healthier looking complexion, that direct contact can sometimes be too harsh for people with sensitive skin (and cause more harm than good).
"I think skin icing is a drastic way to reduce inflammation in the skin," Vergara said. "Direct icing into your skin can produce extreme vasoconstriction and decrease inflammation but after, it produces a greater vasodilating effect which can affect sensitive skins, redness, and patients with rosacea."
Essentially, if this is a trend you're going to participate in, try not to use products that are extremely cold. Vergara recommends using cold compresses or cold hydrating masks to get these results.