Potassium Hydroxide is a harmful ingredient that is found not just in skin care products but in everything from leather tanners and drain cleaners. Also known as lye, Potassium Hydroxide is extremely corrosive and can be found in soaps and shampoos to control the pH of the skin. The trouble is that Potassium Hydroxide is known to cause severe burns and pain in some cases as well as blindness should it get into the eyes.
Read more: http://www.articlesnatch.com/Article/Most-Harmful-Ingredients-In-Your-Skin-Care-Products/953729#ixzz1wFZO8r2y
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i remember that Krave beauty aha have this ingredient. That is why it makes my skin fell itchy