Various effects of photoaging or sundamage of skin including impairment of differentiation of epidermal epithelial cells and loss of collagen fibers, abnormal changes in elastic fibers and deterioration of small blood vessels in the dermis of the skin are retarded by applying topically to the epidermis in a maintenance therapy program effective amounts of retinoids including retinoid derivatives and stereoisomers thereof such that epithelial growths are substantially reduced and prevented and the skin substantially regains and maintains its firmness, turgor and elasticity. Moreover, with persistent treatment dermal blood cells and vessels increase and the epidermis and dermis thicken, resulting in improved ability of the skin to sense, resist and recover from irritation or injury. Further, hyperpigmentation, lines and wrinkles due to aging are reduced and prevented. The treatment is particularly useful for human facial skin and preferably applied in amounts insufficient to cause excessive irritation.
通过在维持治疗方案中向表皮局部施用有效量的
维甲酸(包括
维甲酸衍
生物及其立体异构体),可延缓皮肤光老化或日晒损伤的各种影响,包括表皮上皮细胞分化障碍和胶原纤维的丧失、弹性纤维的异常变化以及皮肤真皮层小血管的退化,从而大大减少和防止上皮增生,并使皮肤大大恢复和保持其紧致度、韧性和弹性。此外,在坚持治疗的情况下,真皮血细胞和血管会增加,表皮和真皮会变厚,从而提高皮肤对刺激或损伤的感知、抵抗和恢复能力。此外,还能减少和预防色素沉着、细纹和因衰老产生的皱纹。这种疗法尤其适用于人的面部皮肤,其用量最好不足以造成过度刺激。