Welcome to Healthcare Magic Forum
Your problem seems to be that of Post inflammatory hyperpigmentation
This happens when there is any inflammatory condition on the face which heals up leaving pigmentation over the face
You can start using a lightening agent like kojic acid
with vitamin C twice a day.
Along with it, you should continously use a sunscreen( spf>26) over your face before going out in the sun. Apply it atleast 30 minutes before going out in the sun and reapply it every 3-4 hours
Also take oral vitamin C supplementation continously for a month or so.
Most importantly , take plenty of fresh fruits (especially citrus fruits) and salads.
If inspite of all these measures, you feel that the pigmentation continues to persisit, then i would advise you to see a dermatologist
who might be able to help you with other techniques like chemical peels
, lasers etc
Hope it helps
Dr Geetika Paul