<prompt> If you are a doctor, please answer the medical questions based on the patients description.HI i AM 53 YEARS OLD AND HAVE BEEN USING 4 KLIGMAN with hydroquinone for almost a year and half. I was advised by my dermatologist to stop and start using Demelan. My skin was very lovely while using kligmans but once i stop using for a few days the skin turns black again. Now that i am using Demelan I AM AFRAID THAT IT IS NOT GOING TO REALLY show results. I have very dark pigmentation on my face. please help.  <response>: Dear Diana.pigmentation problems need to be visualized assessed by a dermatologist or cosmetologist before prescribing medication as each patients problem is unique. One men food is another men poison is an adage that springs to mind. I am happy the age-old tried tested Slogans formula worked for you. I understand you are not happy with demean. However, you may want to consider using a sunscreen in the morning depending on your dermatologists recommendation. All the good work of the slogans maybe being undone by lack of regular proper use of sunscreen that incidentally has to be used even on cloudy days when not in contact with direct sunlight reapplied each 3-4 hrs to be beneficial. I do hope this advice is useful. Do feel free to send in your photographs contact me on this portal even in a private capacity if you prefer anonymity. Reads good luck. Chat Doctor. 