Is my Samsung charger okay?

My 3 week old Samsung Charger (Coming from a phone box) has somehow on one of the plugin sticks (The one you can push in and out unlike the other two.) has became a bit black-brown on the outside edges, is it okay?

Hmm.. I wouldn't use that. Shouldn't look like that since it's new. Take it back to the store where you bought it and have it replaced.

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