I wanted to ask what caused the mark on your neck. I know it is a very visible area, and we are very conscious of it.
(1) I purchased Lactic Acid from Lotion Crafter. It was a 40 ounce container of 90% Lactic Acid (cost about $25). I have been using it since Oct '13 for peels and DIY-ing LA lotion, and still have some left.
I can dilute the 90% to whatever %-age I need by diluting with water.
So, it is very cost effective.
There is an online Batch Calculator that will help you DIY most homemade mixtures.
(2) I purchased 2 types of Kojic Acid soaps originally.
I got Kojie San "Dream White" for my face because it was milder. This is a cream colored soap.
Kojie San "skin Lightening" soap for my body, which is an orange colored soap.
When I first started I left these soaps on for quite some time before rinsing.
Now that I am more exfoliated, they are left on for a lesser time, and I use them less often.
This is all discretionary depending on your own skins tolerance.
My original purchase of the soaps was from (I think) 'Pacific Ave' seller on Amazon, and recently I got from a seller in the Philippines and they are both authentic.
I hope this understandable, if not, I will be happy to give further info.
Edited by Benni - Aug 03 2014 at 6:13pm