Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain Tretin is a retinoid
Isotretinoin and is suitable to reduce acne and its marks and time taken for resolving the symptoms depends from person to person..
Although you need to use the cream for atleast 4 to 6 months depending upon the rate of recovery and compatibility..
You should also use creams containing
Benzoyl peroxide and arbutin over the pimples..
Apply creams containing Kojic acid,
glycolic acid and arbutin to reduce dark spots..
Use
salicylic acid containing body wash as well as face wash..
Drink plenty of water..
Avoid oily food and excess sun exposure..You can also go for body scrubbing and regular peeling facials..
Microdermabrasion and photofacial can also help..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.