Retin-A is used in the treatment of acne. It reduces the formation of pimples and promotes quick healing of pimples that do develop. 

You should wash your face twice a day with a mild non-soap cleanser such as Cetaphil lotion available at your local pharmacy. Pat skin dry with a towel. Let your face dry for 10-15 minutes before applying tretinoin. Apply one pea size drop to the face each night before bed; do not get the medication into your eyes. One pea size drop should be enough to cover the entire face. 

Apply a moisturizer containing a sunscreen of 15 or higher to the skin each morning or an alpha hydroxyacid preparation. This will help counteract the dryness and scaling. Avoid sun exposure between 10 a.m. and 2 p.m. when the sun's rays are the strongest.  If the skin becomes too red and dry, decrease the application of Retin-A to every other night or even every third night.

If you plan to have hair removed by waxing, especially of the upper lip, stop the tretinoin 3-4 weeks prior to the treatment. Otherwise, you may be left with a sore area which could heal with a brown spot. 

Store at room temperature away from sunlight.