Do hydrocolloid pimple patches work?

Hydrocolloid patches work best on raised whiteheads that have come to a head, where they absorb fluid, flatten the blemish faster and stop you picking. They do far less for deep, closed or cystic bumps that have no surface fluid to draw out. Used on the right kind of spot overnight, they are one of the simplest and cheapest tools for calmer-looking skin.