Whats the right way to use tretinoin?what are side effects i may get of this? can i use cetaphil facial cleanser along with it? from 20years old gal

Tretinoin for acne: Tretinoin should be only used once a day, and typically at bedtime is best. You should apply a "pea-sized" amount on the time of your finger, dab the cream on areas of acne only, then massage the cream into the skin. You want to avoid applying it to non-affected, healthy skin to reduce the chance of irritation. Using Cetaphil cleanser is safe for washing your face before applying tretinoin.