Pimple patches, often made with hydrocolloid material, absorb fluid from a blemish and create a protective barrier over it, which can help reduce the urge to pick at it.
Most pimple patches are designed to be worn for several hours or overnight, and are typically ready to be removed once the patch turns white or cloudy, indicating it has absorbed fluid.
Hydrocolloid patches are designed for surface blemishes that have come to a head. Product descriptions indicate the intended use for each patch type.
Some pimple patches are designed to be thin and matte enough to wear under makeup, though this varies by brand — check the product description for compatibility.
Many hydrocolloid patches are fragrance-free. Those with sensitive skin or known adhesive allergies may want to review the product description and follow the labeled directions.