How long should I keep using cosmelan 2 after the mask?

HiThe second phase of Cosmelan has to be used according to your complaint. But the usual protocol for this particular cream is to use thrice in a day starting from 5th day of the mask. This is maintained for 30 days[ 1st month]. Use the cream twice daily for The next 60 days[2nd and 3rd month]  . And again, You can use the cream once in a day for The last 6 months. Hope this will help you. 

Cosmelan is a great treatment. You have to customize the usage of Cosmelan 2 according to your pigmentation. From 6 weeks to 6 months depending on the melasma. Please consult an expert. Best, Dr. Green