Should i be worried about my iphone 5?

I've had this iphone5 for a month now and i've only noticed now that there's a red glowing dot near the top speaker. It can only be seen in the dark. After doing some research i think its supposed to be the proximity sensor but some people say its abnormal to be seeing this? Is this a problem? Should i be worried? What's a proximity sensor anyways and how do i turn off the red dot if possible?

If you've seen it for a month now and it doesn't seem to be affecting your phone don't worry about it. Could you answer my most recent question please?

It's a camera. Turn the camera on and hit the little camera icon in the top right corner of the screen and the camera will switch from the forward facing one to you. It's for self portraits and face time.

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