Hi,
Welcome and thanks for posting your query to Healthcare Magic.
After reading your query I can make out that you have the normal pigmentation around the mouth which is more prominent. It is quite common to find dark areas genetically at these sites.
We have with us the cells known as melanocytes which gives colot to the skin. At some places is naturally producing more color as around mouth in your case.
Applying
tretinoin or
steroid or any face pack would not be of any help in this condition and would be mere wastage of time and even you may harm your skin in long run by any steroid cream application.
For the betterment you can apply "Azelaic acid" or "Kojic acid" in different combinations and strength under dermatological guidance. SO meet a good and proper
dermatologist in your city, explain him the situation and have a good follow up to see the result.
Along with this kindly eat lot of fruits containing
vitamin C and
vitamin A which will act as natural sunscreen and also will help you in improving the color.
Hope these informations will help.
"With good health wishes"
Dr Sanjay Kumar Kanodia
MD (Dermatology & STDs)