 It is important to notice that the skin will not go back to its original color after the none treatment of mequinol.Mequinol should not be used by people that are allergic to any ingredient in mequinol, if you are pregnant, if you have eczema, irritated or inflamed skin, an increased number of white blood cells or if you are sensitive to sunlight or must be outside for prolonged periods of time.Mequinol is used in Europe in concentrations ranging from 2-20% and is approved in many countries for the treatment of solar lentigines.