The main effect of retinoic acid cream is to induce epidermal hyperplasia, etc. It is suitable for the adjuvant treatment of acne vulgaris, flat warts, mucous membrane leukoplakia, erythematous furuncle, follicular keratosis and psoriasis. It should be used under medical supervision. Vitamin A acid cream instructions point out that this product can induce epidermal hyperplasia, so that the granular layer, the thickening of the echinocyte layer, to promote the epidermal granular layer of cells to the stratum corneum differentiation. It inhibits acne production, removes keratin plugs, and prevents and eliminates acne lesions. It also affects melanogenesis, etc. Retinoic Acid Cream is used as an adjunctive treatment for mucous membrane leukoplakia, acne vulgaris, pityriasis rubra, flat warts, keratosis follicularis, and psoriasis. This product may cause skin irritation such as burning sensation, erythema, flaking and other adverse reactions. The drug is contraindicated in the eyes, breastfeeding women, women within the first 3 months of pregnancy, and those who are allergic to the product. Note that eczema, sunburn, acute and subacute dermatitis, rosacea patients should not be used; should not be used in the folds of the skin. Patients are advised to use the drug reasonably under the guidance of a doctor and avoid self-medication.