Not so impressed [SEP] I bought this lactic acid for my husband who has a small dark spot.<br />Well, he used it 3 times, and he broke out exactly on the spot where he put the product, I am sure it was the lactic acid that made him break out because he was putting it only on that spot and the zit popped ONLY on that spot (he usually doesn't get random zits on his face).<br />Very disappointing, I wish I could contact Skin Laboratory but seems like their &#34;contact page&#34; doesn't work.<br />Well, if you see this review please contact me, I am extremely disappointed by your product and would like to send it back for a refund.<br /><br />Update: I started using it myself for a dark spot, I forgot about it and left it on all night, my fault clearly, and it &#34;ate&#34; my skin, now I have raw skin and like a &#34;hole&#34; ... hoping for new skin to grow as it doesn't look pretty :( - peeling went wrong. I do not have sensitive skin, can't imagine what it would have done to someone else ... be careful, powerful stuff.