Effect of Tretinoin on Actininc Keratoses

Tazarotene cream for the treatment of facial photodamage: a multicenter, investigator-masked, randomized, vehicle-controlled, parallel comparison of 0.01%, 0.025%, 0.05%, and 0.1% tazarotene creams with 0.05% tretinoin emollient cream applied once daily for 24 weeks (2001)

Topical tretinoin improves photoaged skin. A double-blind vehicle-controlled study (1988)