Dexamethasone is a prescription drug used in dermatology to treat dermatitis and eczema, which belongs to glucocorticoid. Some brands illegally add dexamethasone to make their products take effect quickly. In fact, once the skin care products added with dexamethasone are stopped, the skin will have adverse reactions, so glucocorticoid is also called "skin opium". Bliv blackhead gel was once used as a skin care product by network celebrities, but it has a remarkable effect due to the addition of glucocorticoid, which can be described as sinister.