Hi Guilia  -  I hope this reaches you in time because I'm really concerned that you're trying to do this peel at home.  You have olive skin too which makes peels like this more likely to cause problems.  And, on top of that, you have melasma which can sometimes get worse if the peel and the pre and post care for the peel aren't done correctly.  Please, please, please let a professional do your peels and don't take the risk of making your skin a mess!! Dr. Irwin