Ahmad, Ijaz, Zarnaz Wahid, and Mujeeb Ansari. 2017. “Melasma: A Comparative Trial of Azelaic Acid (20%) Cream Alone and in Combination With Tretinoin (0.1%) Cream”. Journal of Pakistan Association of Dermatologists 14 (1):10-15. https://www.jpad.com.pk/index.php/jpad/article/view/770.