The correct way to use Vitamin A cream for blackheads is to use it away from light, apply it once a day at night or before bedtime on the blackhead area, and prohibit contact with the mucous membranes of the mouth, eyes and nose. Vitamin A Acid Cream has a keratin-regulating effect and can be used to treat skin disorders such as acne vulgaris and mucous membrane leukoplakia. The drug has photosensitivity, sunlight exposure can aggravate the skin irritation of the drug, during the use of the drug should pay attention to avoiding light. Vitamin A cream has teratogenicity and irritation, may appear skin burning sensation, erythema, flaking and other symptoms; allergic to the product, pregnant women, patients with acute or subacute dermatitis, eczema skin diseases prohibit the use of vitamin A cream. This product is prohibited to be applied to the folds of the skin, should not be applied to a large area, and the daily dosage is not more than 20 grams. When using Vitamin A acid cream for treatment, it must be used under the guidance of a doctor in strict accordance with medical advice, and the adverse drug reactions should be discontinued in time.