What would be a good moisturizer for extremely dry skin?

For around two years now, I have been using 2 acne creams (Differin XP and Clyndoxyl Gel) and it makes my skin really dry and flaky. I have tried a few moisturizers but they%26#039;re just not helping much, after a few hours, the area around my mouth would be dry again. What moisturizers do you recommend for my dry skin (face only) ?|||Any moisturiser...even cheap sorbolene....after a few hours????? It%26#039;s time to wash your face again......perhaps a little more washing, a little less acne treatment, and some moisturiser would be a good comination. I have so oily skin....I have to wash 6-8 times a day at least,,,,I%26#039;m 50 and wish I had some of your dryness.