How long before seeing results from kligman cream? Any other recommendations?

So on my arm i have this dark patch since i was very young through my inner arm which i have been using kligman for. I also have darker skin under the buttocks (the joint to the legs) I have used kligman cream for 6 weeks now and i have seen no results. Why? Since i opened the cream the formula has darkened and there is some oil in it-why? i have a shower and apply the cream-could water neutralise the formula? Any other treatment recommendations please?

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