Hello Thanks for your query. I will try my best to provide you with best possible professional recommendations to your questions. When the melacream is not properly used, hyper pigmentation can occur. It should be applied at night and thoroughly washed in the morning with soap or using same face wash. While going out one should apply sun screen. It should be followed every day. For dark circle around the eye, it can reduced by proper sleep, certain home remedies like applying Cucumber slices, ice cube wrapped in soft cloth to your eyes daily will help. Try this treatment first if it does not reduce there are certain creams that you can try. Apply an eye cream containing vitamin K and retinol. Dark circles may be caused by a deficiency of vitamin K. Regardless of the cause, however, skin creams containing these two ingredients reduce puffiness and discoloration significantly in many people. Yet again, I do hope that you have found something helpful and I will be glad to answer any further query. Regards