Hi,
Melasma often fades over several months after stopping birth control pills or HRT, or after delivering a child. It may return with additional pregnancies or use of these medications.
If it persists, creams containing a combination of tretinoin, kojic acid, and azelaic acid have been shown to improve the appearance of melasma. Occasionally, chemical peels or topical steroid creams may also help. (ref: http://www.nlm.nih.gov/medlineplus/ency/article/000836.htm)
Talk to your doctor which option is best for you. Avoiding the sun and using sunscreen also help to prevent melasma.
Take care and regards.
Diets rich in bcomplex and vitc help.Do no apply lightening cremes.Sunscreen lotions are useful.