hi
I completely understand your concern and I hope I am able to help you for the same.
Since you have pigmentation of the face, I would advice that you use some kind of a lightening agent like kojic acid and vitamin c combination over the areas.
This is a simple, harmless lightening agent which can be used for as long the blackish pigmentation is there.
Also ,try not to touch the area too much.
Use proper sunscreen (spf>26) before going out in the sun so that the lesions doesn't darken any further.
Take a diet rich in vitamin C and antioxidants like Citrus fruits and lots of 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, dermabrasion , lasers etc .
Hope it helps
Dr Geetika Paul