Retinoid ointment has the ability to soften keratinization and also provide some anti-inflammatory properties. The main ingredient of retinoid ointment is a derivative of vitamin A, commonly known as vitamin A acid. Vitamin A derivatives can regulate the differentiation of the epithelial cells of the sebaceous glands of the hair follicles and have a softening effect on keratinization, while also playing a certain anti-inflammatory role. Retinoic acid ointment is widely used in the clinic, clinically mainly used for the treatment of facial acne, but also for keratosis pilaris, ichthyosis and other diseases caused by keratinization abnormalities have a certain degree of improvement and relief. Topical application of retinoic acid cream may cause some skin irritation, obvious erythema or flaking, under normal circumstances, the skin can mostly adapt and tolerate, such symptoms can gradually disappear. If the irritation persists or worsens, it is important to consult a dermatologist and use the medication under the guidance of a physician.