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Marwah, it sounds like skin discoloration or hyperpigmentation. It's common in desi people. I've had it on my cheek and Alhumdolillah it's gone now. The most effective way to get rid of it is to get a hydrqouinone cream from the dermatologist. Hydroquinone or HQ is an FDA approved chemical used for lightening skin. In commerical products, you will usually find a concentration of 2%. For a higher concentration, you'll have to get a prescription. In a few weeks, it'll fade away. Make sure that you apply sunscreen when using HQ products at least 30 minutes before going out.

You can try commerical products and natural ingredients which contain a bleaching effect (example: lemons, tomatoes, yogurt, etc)........but it will take longer. Your dermatologist can will prescribe treatments that penetrate the layers of your skin to correct the problem. People usually don't realize that their blemishes/spots/discolorations are made up of SEVERAL layers of skin.

Apply sunblock on your hands. Do you think maybe you're allergic to some soap, detergent, or cream you've been using?