i assume that you were suffering from Melasma
by saying that you had a change in facial color,
SO i think the best suggestion would be try to avoid sunlight as much as you can and also wear a good quality sunblock religiousely minimum of 30 SPF especially from 9am-4pm.
2:drink plenty of water,lots of fruits and vegs and a good night sleep.
3:If melasma is not responding to any medication then you need to see a dermatologist
who have expertise in Lasers and cosmetology because there are some good and effective lasers aswel if melasma is not responding topical medications.:
4:Now you would ask me which type of lasers? then i would say i need to see youer skin tyoe thats why i urged to consult a dermatologist/cosmetologist.
I think i can give you this much advise without knowning much of your history,so all the best for now.