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There are a number of ways to cover up or bleach out uneven skin, and the right method will depend on the sort of uneven skin problem you have. 

You may have a birthmark, freckles, a scar, a burn scar, or any number of different skin conditions which cause patches or spots that make you feel self-conscious. 

For a very mild skin discoloration, you might want to try simple homemade remedies like lemon juice, ginger, turmeric, or a combination of these things. 

Vitamin C is probably the main chemical which can have some effect on lightening your skin, although it doesn't work overnight, and only works in cases where a mild effect can be beneficial. 

In most cases if you have uneven skin tone, you may have to use stronger chemical products, and there are many to choose from, although you need to be careful about which one you choose, as there are some disreputable companies around the world selling their products online. 

Some of these chemicals can have serious side effects, for example there have been products found that contain mercury, and the side effects of mercury poisoning over a long period of time are quite profound. 

For the most part, you don't have to worry about that, it was just some African and Asian brands that were including that substance, but it should open your eyes to the fact that you cannot trust that every product is safe when buying online. 

The worldwide web is a portal to the world, and so you must carefully research a company by finding out how long they've been in business, and looking for good and bad reviews, before and after shots and that sort of thing. 

It's also very important that the ingredients are listed prominently on the website. You can get accurate information on the effects and side effects of these chemicals from government sites like the FDA, medical journals, educational sites to do with health care, (sometimes it's not entirely clear which ones are really educational, try looking for the .edu), and Wikipedia is generally a good source of information on skin lightening.

It's important to learn as much as you can before you begin with a particular treatment. Some chemicals like arbutin, glycolic acid, and kojic acid can work well over a long period of time, with only minor side effects. 

Other chemicals like hydroquinone and various other bleaching treatments like injections and pills that you swallow can have terrible side effects. 

You can't trust one source this post is great for you knowr information, so you might want to talk to a doctor, a pharmacist, and then get a second opinion, and do hours of searching online for trustworthy information and professionals who have had a long history of success in the field. 

You can find quality information on this site, and in the links in the sidebar, and the links in this article, but don't just go with the cheapest product you find that claims to be able to give you the results you're looking for, because it's a serious cosmetic procedure that must be done right, with a full knowledge of what to expect, and what to avoid.